Anatomy
5 questionsMatch the cardiac anatomical features from Column I with their corresponding labels from Column II. Column I: 1. Receives oxygenated blood from pulmonary veins; 2. Lies anterior to ascending aorta; 3. Arises from LV; 4. Hypertrophy in pulmonary stenosis. Column II: A. Ascending aorta; B. Right ventricle; C. Pulmonary trunk; D. Left atrium.
Match the following anatomical structures with their correct image labels: 1. Seminal vesicles 2. Ureter 3. Prostate 4. Vas deferens
Which muscles are supplied by the superficial peroneal nerve?
Identify the region indicated by the number 3 in the given image.
What is the action of the muscle marked in the image?
INI-CET 2025 - Anatomy INI-CET Practice Questions and MCQs
Question 191: Match the cardiac anatomical features from Column I with their corresponding labels from Column II. Column I: 1. Receives oxygenated blood from pulmonary veins; 2. Lies anterior to ascending aorta; 3. Arises from LV; 4. Hypertrophy in pulmonary stenosis. Column II: A. Ascending aorta; B. Right ventricle; C. Pulmonary trunk; D. Left atrium.
- A. 1-D, 2-C, 3-A, 4-B (Correct Answer)
- B. 1-A, 2-B, 3-C, 4-D
- C. 1-B, 2-D, 3-C, 4-A
- D. 1-C, 2-A, 3-D, 4-B
Explanation: 1-D, 2-C, 3-A, 4-B - 1-D (Receives oxygenated blood): The left atrium receives four pulmonary veins carrying oxygenated blood from the lungs [1], making it the only chamber that receives oxygenated blood directly from pulmonary circulation. - 2-C (Lies anterior to ascending aorta): The pulmonary trunk is positioned anteriorly and slightly to the left of the ascending aorta as both vessels exit from the base of the heart. - 3-A (Arises from LV): The ascending aorta arises directly from the left ventricle through the aortic valve and is the major systemic artery carrying oxygenated blood to the body. - 4-B (Hypertrophy in pulmonary stenosis): Pulmonary stenosis increases resistance to right ventricular outflow, causing chronic pressure overload and subsequent right ventricular hypertrophy. 1-A, 2-B, 3-C, 4-D - This matching is incorrect because the ascending aorta (A) does not receive blood from pulmonary veins [1]; it arises from the LV and carries blood away from the heart. Additionally, the pulmonary trunk (C) arises from the right ventricle, not the left ventricle. 1-B, 2-D, 3-C, 4-A - This matching is incorrect because the right ventricle (B) receives deoxygenated blood from the right atrium via the vena cavae, not oxygenated blood from pulmonary veins [1]. The left atrium (D) is a posterior chamber and does not lie anterior to the ascending aorta. 1-C, 2-A, 3-D, 4-B - This matching is incorrect because the pulmonary trunk (C) carries deoxygenated blood to the lungs; it does not receive oxygenated blood from pulmonary veins [1]. The left atrium (D) is not a vessel that arises from the LV—the correct structure is the ascending aorta (A).
Question 192: Match the following anatomical structures with their correct image labels: 1. Seminal vesicles 2. Ureter 3. Prostate 4. Vas deferens
- A. 1-D, 2-C, 3-A, 4-B (Correct Answer)
- B. 1-D, 2-B, 3-A, 4-C
- C. 1-B, 2-C, 3-D, 4-A
- D. 1-A, 2-B, 3-C, 4-D
Explanation: ***Correct: 1-D, 2-C, 3-A, 4-B*** - This option correctly identifies the labeled structures: **A** is the **prostate gland**, inferior to the bladder; **B** is the **vas deferens**, hooking over the ureter; **C** is the **ureter**, entering the posterior bladder wall; and **D** are the **seminal vesicles**, located posterior to the bladder. - The relationships are accurate: the **vas deferens (B)** transports sperm from the epididymis, the **seminal vesicles (D)** produce seminal fluid, the **prostate (A)** contributes prostatic fluid, and the **ureter (C)** transports urine from the kidneys. *Incorrect: 1-A, 2-B, 3-C, 4-D* - This option incorrectly identifies the **prostate gland (A)** as the seminal vesicles. The prostate is a single, walnut-sized gland, whereas the seminal vesicles (D) are paired and lobulated. - It also mislabels the **ureter (C)** as the prostate and the **vas deferens (B)** as the ureter, which is anatomically incorrect. *Incorrect: 1-B, 2-C, 3-D, 4-A* - This option incorrectly labels the **vas deferens (B)** as the seminal vesicles and the **seminal vesicles (D)** as the prostate. - The prostate (A) is a singular structure at the base of the bladder, not the vas deferens, which is a tubular structure. *Incorrect: 1-D, 2-B, 3-A, 4-C* - This choice incorrectly swaps the **ureter** and the **vas deferens**. Label **C** points to the ureter entering the bladder, not the vas deferens. - Label **B** points to the **vas deferens**, which is seen hooking over the ureter (C), and not the ureter itself.
Question 193: Which muscles are supplied by the superficial peroneal nerve?
- A. Both A & C
- B. Peroneus longus & Brevis (Correct Answer)
- C. Extensor hallucis longus
- D. Peroneus tertius
Explanation: ***Peroneus longus & Brevis*** - The **superficial peroneal nerve** (superficial fibular nerve) supplies **only two muscles**: **Peroneus longus** and **Peroneus brevis** - These muscles form the **lateral compartment of the leg** - They function primarily in **ankle eversion** and contribute to **plantar flexion** - The superficial peroneal nerve is a terminal branch of the **common peroneal nerve** that arises at the neck of the fibula *Incorrect - Both A & C* - This option incorrectly combines different muscle groups - Option C refers to muscles supplied by the **deep peroneal nerve**, not the superficial peroneal nerve *Incorrect - Extensor hallucis longus* - This muscle is located in the **anterior compartment** of the leg - It extends the great toe and assists in ankle dorsiflexion - It is innervated by the **deep peroneal nerve**, NOT the superficial peroneal nerve *Incorrect - Peroneus tertius* - This muscle belongs to the **anterior compartment** despite its name - It acts as a dorsiflexor and evertor of the foot - It is supplied by the **deep peroneal nerve**, NOT the superficial peroneal nerve - The superficial peroneal nerve only supplies the lateral compartment muscles (Peroneus longus and brevis)
Question 194: Identify the region indicated by the number 3 in the given image.
- A. Vertex
- B. Forehead
- C. Ear
- D. Back of neck (Correct Answer)
Explanation: ***Back of neck*** - The number 3 indicates the **squamous part** of the **occipital bone**, which forms the posterior base of the cranium. This region corresponds externally to the upper part of the back of the neck and the back of the head. - This area includes landmarks like the **external occipital protuberance** and **superior nuchal line**, which serve as attachment points for major neck muscles like the **trapezius**. *Ear* - The structures of the ear are associated with the **temporal bone**, which is located lateral to the occipital bone shown in the image. - Region 3 is situated at the posterior midline, far from the lateral position of the ears. *Vertex* - The **vertex** is the most superior point of the skull, located at the junction of the **sagittal** and **coronal sutures**. - The image displays an inferior view of the skull base, which is anatomically opposite to the superiorly located vertex. *Forehead* - The forehead is formed by the **frontal bone**, which constitutes the anterior part of the cranium. - Region 3 is located at the posterior aspect of the skull, making it the anatomical opposite of the forehead.
Question 195: What is the action of the muscle marked in the image?
- A. Internal rotation
- B. Knee flexion
- C. Knee extension
- D. Hip abduction (Correct Answer)
Explanation: ***Hip abduction*** - The image displays the **gluteus medius** muscle, whose primary action is to **abduct** the thigh at the hip joint. - This muscle is crucial for stabilizing the pelvis during the gait cycle; weakness leads to a positive **Trendelenburg sign**. ***Internal rotation*** - While the anterior fibers of the **gluteus medius** contribute to internal rotation, it is not its primary function. - The primary internal rotators of the hip are the **gluteus minimus** and the **tensor fasciae latae**. ***Knee extension*** - The **gluteus medius** does not cross the knee joint and therefore has no action on knee extension. - Knee extension is the primary function of the **quadriceps femoris** muscle group, located in the anterior thigh. ***Knee flexion*** - The **gluteus medius** does not act on the knee joint, so it cannot cause knee flexion. - Knee flexion is primarily performed by the **hamstring muscles** (biceps femoris, semitendinosus, and semimembranosus) located in the posterior thigh.
ENT
1 questionsA 35-year-old man presents to the emergency department with a complaint of food stuck in his throat. On examination, a bone is seen in the left piriform recess. Which of the following is most likely to be impaired?
INI-CET 2025 - ENT INI-CET Practice Questions and MCQs
Question 191: A 35-year-old man presents to the emergency department with a complaint of food stuck in his throat. On examination, a bone is seen in the left piriform recess. Which of the following is most likely to be impaired?
- A. Cough reflex
- B. Salivation
- C. Gag reflex (Correct Answer)
- D. Mastication
Explanation: ***Gag reflex*** - The **piriform recess (piriform fossa)** is located within the **hypopharynx**, lateral to the laryngeal opening, and is part of the pharyngeal space where the gag reflex is mediated. - A foreign body (bone) lodged in the piriform recess would **directly stimulate and affect** the **gag reflex** by irritating the pharyngeal mucosa innervated by the **glossopharyngeal nerve (CN IX)** (afferent limb) and **vagus nerve (CN X)** (efferent limb). - The **superior laryngeal nerve** (internal branch), which supplies sensation to the piriform fossa, contributes to triggering the gag reflex when this area is stimulated by a foreign body. - This makes the gag reflex the **most directly affected reflex** in this clinical scenario, as the foreign body is in direct contact with the pharyngeal structures that mediate this protective reflex. *Incorrect: Cough reflex* - The cough reflex is primarily mediated by sensory innervation from the **vagus nerve (CN X)** to the **larynx below the vocal cords, trachea, and bronchi**. - While the piriform recess is adjacent to the laryngeal inlet, a foreign body lodged here typically causes dysphagia and affects the gag reflex rather than primarily impairing the cough reflex. - The cough reflex would be more affected if the foreign body were aspirated into the larynx or trachea. *Incorrect: Mastication* - Mastication (chewing) is controlled by the **trigeminal nerve (CN V)**, which innervates the muscles of mastication (masseter, temporalis, pterygoids). - These structures are located in the oral cavity and are anatomically distant from the piriform recess. - A foreign body in the hypopharynx causes **dysphagia** (difficulty swallowing) and **odynophagia** (painful swallowing), not difficulty with chewing. *Incorrect: Salivation* - Salivation is controlled by parasympathetic innervation via the **facial nerve (CN VII)** (submandibular and sublingual glands) and **glossopharyngeal nerve (CN IX)** (parotid gland). - While pain or discomfort from a foreign body might reflexively affect salivation, this is an indirect effect and not the primary reflex associated with the piriform recess. - The neurological pathways controlling salivary secretion are not directly impaired by a foreign body in the pharynx.
Ophthalmology
1 questionsWhich of the following is the diagnosis based on the given eye movement abnormality image?
INI-CET 2025 - Ophthalmology INI-CET Practice Questions and MCQs
Question 191: Which of the following is the diagnosis based on the given eye movement abnormality image?
- A. 3rd nerve palsy
- B. Internuclear ophthalmoplegia (Correct Answer)
- C. 6th nerve palsy
- D. Horizontal gaze palsy
Explanation: **Internuclear ophthalmoplegia** - This diagnosis is indicated by the failure of the right eye to **adduct** (move inwards) when looking to the left, which is a hallmark sign. This specific defect is caused by a lesion in the **Medial Longitudinal Fasciculus (MLF)** on the same side as the adduction failure. - Another key feature shown is **nystagmus** in the contralateral (left) eye during **abduction** (outward movement). This combination of ipsilateral adduction failure and contralateral abducting nystagmus is classic for INO. *3rd nerve palsy* - A 3rd nerve palsy would present with the affected eye positioned 'down and out' due to unopposed action of the superior oblique and lateral rectus muscles. It also typically involves **ptosis** and a **dilated pupil**. - In the given image, the vertical movements and pupillary function are not depicted as abnormal, and the primary issue is with horizontal conjugate gaze, not the multiple deficits seen in 3rd nerve palsy. *6th nerve palsy* - This condition results in the inability to **abduct** the eye (move it outwards) due to paralysis of the **lateral rectus muscle**. The patient would complain of horizontal diplopia, worse on gaze towards the affected side. - The image shows that both eyes are capable of abduction. The defect is clearly in adduction of the right eye. *Horizontal gaze palsy* - This involves the inability of **both eyes** to move in one horizontal direction. It is caused by a lesion in the pontine gaze center, the **Paramedian Pontine Reticular Formation (PPRF)**. - In this case, the left eye successfully moves to the left, and both eyes can move to the right, ruling out a complete gaze palsy to either side.
Orthopaedics
1 questionsA teenager presents to the emergency department with wrist pain after falling off his skateboard. He has snuff-box tenderness. Which bone is likely fractured?
INI-CET 2025 - Orthopaedics INI-CET Practice Questions and MCQs
Question 191: A teenager presents to the emergency department with wrist pain after falling off his skateboard. He has snuff-box tenderness. Which bone is likely fractured?
- A. Trapezoid
- B. Trapezium
- C. Scaphoid (Correct Answer)
- D. Capitate
Explanation: ***Scaphoid*** - **Snuff-box tenderness** is the classic and most reliable clinical sign indicating a scaphoid fracture, usually sustained after a **fall onto an outstretched hand (FOOSH)**, common in young adults and teenagers. - The **scaphoid** is the most frequently fractured carpal bone (approx. 60%) and requires careful immobilization and follow-up due to the high risk of **avascular necrosis** from its retrograde blood supply. ***Trapezoid*** - Fractures of the trapezoid are extremely rare (less than 1% of carpal fractures) because of its stable position wedged between the **second metacarpal** and other carpals. - Tenderness for an isolated trapezoid fracture would be localized to the dorsal aspect of the wrist, more centrally, not specifically within the anatomical snuff box which is bounded by the **extensor tendons** of the thumb. ***Capitate*** - The capitate is the largest carpal bone, located in the center of the wrist, articulating with the **third metacarpal**; it is the second most commonly fractured carpal bone after the scaphoid. - Tenderness would be localized more centrally over the dorsal wrist, proximal to the third metacarpal base, and is not associated with classic **snuff-box tenderness**. ***Trapezium*** - The trapezium carpal bone articulates primarily with the **first metacarpal (thumb)**, forming the highly mobile carpometacarpal joint. - A fracture typically results in tenderness localized to the base of the thumb or the **thenar eminence**, rather than the radial dorsal wrist corresponding to the anatomical snuff box.
Physiology
1 questionsWhich of the following mechanisms is used by the marked structure to influence neighboring cells?
INI-CET 2025 - Physiology INI-CET Practice Questions and MCQs
Question 191: Which of the following mechanisms is used by the marked structure to influence neighboring cells?
- A. Nerve mediated
- B. Vein mediated
- C. Paracrine (Correct Answer)
- D. Autocrine
Explanation: ***Paracrine*** - The image displays an **Islet of Langerhans** (endocrine component) embedded within the **exocrine acini** of the pancreas. Hormones released from the islet cells act on the adjacent acinar cells, which is a classic example of **paracrine signaling**. - Specifically, **insulin** released from islet beta cells potentiates exocrine enzyme secretion, while **somatostatin** from delta cells inhibits both endocrine and exocrine secretions locally. - **Paracrine signaling** involves secretion of signaling molecules that affect nearby target cells in the local environment. *Incorrect: Nerve mediated* - Although the pancreas is innervated by the **autonomic nervous system** which regulates both endocrine and exocrine functions, this is not the mechanism by which islet cells *directly* influence their immediate neighboring acinar cells. - Nerve-mediated control involves neurotransmitters released from nerve endings, not signaling molecules released from the islet cells themselves to act on adjacent acini. *Incorrect: Vein mediated* - This describes **endocrine signaling**, where hormones enter the bloodstream to act on distant target organs. While islet hormones do enter veins for systemic effects, their influence on *neighboring cells* is through local diffusion (paracrine), not via the circulation. - The pancreas has a unique **islet-acinar portal system** where blood from islets perfuses the surrounding acini, but the direct local signaling mechanism is paracrine. *Incorrect: Autocrine* - **Autocrine signaling** refers to cells responding to signaling molecules they themselves secrete. For example, some islet cells may respond to their own insulin or glucagon. - However, the question asks about influencing *neighboring cells* (acinar cells), not self-stimulation, making paracrine the correct mechanism.
Surgery
1 questionsCleft lip primary muscle repair is required in which of the following muscles?
INI-CET 2025 - Surgery INI-CET Practice Questions and MCQs
Question 191: Cleft lip primary muscle repair is required in which of the following muscles?
- A. Levator palpebrae superioris
- B. Orbicularis oris (Correct Answer)
- C. Orbicularis oculi
- D. Masseter
Explanation: ***Orbicularis oris*** - The **orbicularis oris** muscle forms the main sphincter of the mouth and is interrupted in a cleft lip. Repair involves meticulous anatomical realignment of this muscle for correct function and appearance. - Dysfunction of this muscle in unrepaired cleft lip leads to **vermilion deficiency**, **cupid's bow distortion**, and poor feeding/speech. *Orbicularis oculi* - This muscle surrounds the eye and is responsible for blinking and closing the eyelid; it is not primarily affected in a standard cleft lip. - Though part of the facial musculature, its involvement is secondary, mainly due to potential nerve injury during extensive **craniofacial procedures**, not cleft lip repair. *Levator palpebrae superioris* - This muscle elevates the upper eyelid and is innervated by the **oculomotor nerve (CN III)**. It is not involved in cleft lip pathology or repair. - Its function is essential for vision, and damage results in **ptosis**, a concern unrelated to primary lip closure. *Masseter* - The masseter is a powerful muscle of mastication, innervated by the **trigeminal nerve (CN V)**. It is located in the cheek and is not part of the required functional repair for a cleft lip. - Its primary role is in **jaw closure (chewing)**, and its integrity is preserved during standard cleft lip repair procedures.