Systemic Anatomy — MCQs
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The connection of two bony structures with a ligament is known as
Thickest portion of sclera is -
Joint between epiphysis and diaphysis of a long bone is a type of -
The location of Schatzki's ring is
Wieger's ligament is?
Diameter of fovea centralis is:
The anterior segment of the eyeball includes structures lying in front of the:
What is the extension of the vaginal lumen around the intravaginal part of the uterine cervix called?
Arterio-venous anastomosis is not seen in:
Which vertebra is known as vertebra prominens due to its long and prominent spinous process:
Systemic Anatomy Indian Medical PG Practice Questions and MCQs
Question 151: The connection of two bony structures with a ligament is known as
- A. Diarthrosis
- B. Syndesmosis (Correct Answer)
- C. Synchondrosis
- D. Synostosis
Explanation: Syndesmosis - A syndesmosis is a type of fibrous joint where two bones are joined by a ligament, band of fibrous tissue, or interosseous membrane. - Examples include the distal tibiofibular joint and the interosseous membrane between the radius and ulna. Diarthrosis - Diarthrosis refers to a freely movable joint, also known as a synovial joint, which has a joint capsule, synovial fluid, and articular cartilage. - This term describes the degree of movement rather than the specific tissue uniting the bones. Synchondrosis - A synchondrosis is a type of cartilaginous joint where two bones are joined by hyaline cartilage. - Examples include the epiphyseal plates in growing bones and the joint between the first rib and the sternum. Synostosis - A synostosis is a joint where two bones that were originally separate have fused completely, resulting in a solid bony union. - This represents the ossification of a fibrous or cartilaginous joint over time, such as the cranial sutures in adults or the sacrum.
Question 152: Thickest portion of sclera is -
- A. Posterior pole (Correct Answer)
- B. Posterior to rectus muscle insertion
- C. Anterior to rectus muscle insertion
- D. Limbus
Explanation: ***Posterior pole*** - The sclera is thickest at the **posterior pole**, particularly around the optic nerve entrance, where it provides structural support for the optic nerve head. - This region forms a robust protective layer for the delicate structures within the posterior segment of the eye. *Posterior to rectus muscle insertion* - While the sclera is relatively thick in this region compared to the equator, it is generally thinner than the posterior pole. - The rectus muscles insert approximately 5-7 mm from the limbus, and their insertion points represent thinner areas of the sclera. *Anterior to rectus muscle insertion* - This area, encompassing the region between the limbus and the rectus muscle insertions, is generally thinner than the posterior pole. [1] - The sclera gradually thickens towards the posterior pole and thins towards the limbus. [1] *Limbus* - The **limbus** is the thinnest part of the sclera, where it transitions into the transparent cornea. [1] - This **corneoscleral junction** is a crucial anatomical landmark but represents the thinnest portion of the scleral tissue.
Question 153: Joint between epiphysis and diaphysis of a long bone is a type of -
- A. Fibrous joint
- B. Plane Synovial joint
- C. Synchondrosis (Correct Answer)
- D. Symphysis
Explanation: ***Synchondrosis*** - A **synchondrosis** is a type of cartilaginous joint where the bones are joined by **hyaline cartilage**. [2] - The joint between the **epiphysis and diaphysis** of a long bone (the epiphyseal plate) is a classic example, as it is composed of hyaline cartilage that allows for bone growth. [1], [2] *Fibrous joint* - **Fibrous joints** are characterized by bones united by dense connective tissue, offering little to no movement (e.g., sutures of the skull). - They lack a cartilage-based union between growing bone segments. *Plane Synovial joint* - A **plane synovial joint** is a freely movable joint with a joint capsule, synovial fluid, and articular cartilage, allowing gliding movements (e.g., intercarpal joints). - The epiphyseal plate is a temporary cartilaginous union, not designed for movement. *Symphysis* - A **symphysis** is a cartilaginous joint where bones are united by a plate of **fibrocartilage**, offering limited movement (e.g., pubic symphysis, intervertebral discs). - The epiphyseal plate is made of hyaline cartilage, not fibrocartilage.
Question 154: The location of Schatzki's ring is
- A. Upper esophagus
- B. Pharyngoesophageal junction
- C. Lower end of esophagus (Correct Answer)
- D. Gastric antrum
Explanation: ***Lower end of esophagus*** - Schatzki's ring is a **circumferential, thin mucosal fold** typically found at the **esophagogastric junction**. [1][2] - It is associated with **hiatal hernia** and can cause **dysphagia** for solid foods. [1] *Upper esophagus* - This region is more commonly associated with conditions like **Zenker's diverticulum** or **esophageal webs**, not Schatzki's ring. - Strictures in the upper esophagus usually have different etiologies, such as caustic injury or radiation. *Pharyngoesophageal junction* - This area is the transition between the pharynx and esophagus, and while it can have strictures or webs (e.g., **Plummer-Vinson syndrome**), it is not the typical location for Schatzki's ring. - The cricopharyngeal muscle is located here and can be a source of dysphagia. *Gastric antrum* - The gastric antrum is part of the stomach, located distal to the esophagus, and is not where Schatzki's rings form. - Conditions affecting the gastric antrum include **gastric ulcers** or **pyloric stenosis**.
Question 155: Wieger's ligament is?
- A. Attachment of vitreous to ora serrata
- B. Attachment of vitreous to posterior surface of lens (Correct Answer)
- C. Attachment of vitreous to optic disc
- D. Attachment of vitreous to the retina
Explanation: ***Attachment of vitreous to posterior surface of lens*** - **Wieger's ligament**, also known as the **hyaloid capsular ligament**, describes the strong, circular attachment of the anterior vitreous face to the posterior capsule of the crystalline lens. - This attachment forms an annular ring with a diameter of about 8-9 mm, providing stability to the lens and vitreous body. *Attachment of vitreous to ora serrata* - The attachment of the vitreous to the **ora serrata** is a normal anatomical vitreous base, but it is not referred to as Wieger's ligament. - The vitreous base is the strongest attachment site of the vitreous, extending up to 2 mm anterior and 2-3 mm posterior to the ora serrata. *Attachment of vitreous to optic disc* - The attachment of the vitreous to the **optic disc** is typically a weaker, looser adhesion compared to the lens connection. - This area is associated with the peripapillary glial tissue and is a common site for posterior vitreous detachment (PVD). *Attachment of vitreous to the retina* - While the vitreous is in contact with the retina, it has strong attachments at specific points like the **vitreous base** (around the ora serrata) and around major retinal vessels, but not along the entire retina. - Wieger's ligament is specifically concerned with the lens-vitreous interface.
Question 156: Diameter of fovea centralis is:
- A. 1.0 mm
- B. 0.5 mm
- C. 2.5 mm
- D. 1.5 mm (Correct Answer)
Explanation: ***1.5 mm*** - The **fovea centralis** is a small, central pit in the macula lutea of the retina responsible for **sharpest vision** and highest visual acuity. - Its typical diameter is approximately **1.5 mm**, although the central region, the **foveola**, is much smaller. *1.0 mm* - This value is close but slightly smaller than the generally accepted average diameter for the entire fovea centralis. - While it might refer to a specific sub-region or a range, it is not the standard overall diameter. *0.5 mm* - This measurement is generally associated with the **foveola**, which is the central floor of the fovea, not the entire fovea centralis. - The foveola is the area with the highest concentration of **cone photoreceptors** and lacks rod photoreceptors. *2.5 mm* - This diameter is larger than the fovea centralis but does not correspond to a standard anatomical measurement. - The entire **macula lutea** is approximately **5-5.5 mm in diameter**, which encompasses the fovea and is responsible for central, high-resolution color vision.
Question 157: The anterior segment of the eyeball includes structures lying in front of the:
- A. Iris
- B. Vitreous body (Correct Answer)
- C. Cornea
- D. Crystalline lens
Explanation: ***Vitreous body*** - The **anterior segment** of the eyeball is defined as the region in front of the **vitreous body**. - This segment includes the **cornea, iris, ciliary body, lens**, and the **aqueous humor** [2]. *Iris* - The **iris** is a part of the anterior segment itself, not a landmark that defines its posterior boundary [1]. - It lies in front of the lens but behind the cornea. *Cornea* - The **cornea** is the most anterior transparent part of the eye, forming the front wall of the anterior segment [2]. - It does not define the posterior limit of the anterior segment. *Crystalline lens* - The **crystalline lens** is located within the anterior segment, specifically behind the iris and in front of the vitreous body [3]. - It helps divide the anterior segment into the anterior and posterior chambers but does not mark the boundary between the anterior and posterior segments of the eyeball [3].
Question 158: What is the extension of the vaginal lumen around the intravaginal part of the uterine cervix called?
- A. Rectouterine pouch (pouch of Douglas)
- B. Uterine cavity (lumen)
- C. Cervical canal (passage through cervix)
- D. Fornix (vaginal recess) (Correct Answer)
Explanation: ***Fornix (vaginal recess)*** - The **fornix** is the anatomical term for the arched, blind-ended recess formed by the extension of the vaginal lumen around the protruding **intravaginal part of the uterine cervix** [1]. - It is typically divided into anterior, posterior, and two lateral fornices [1]. *Rectouterine pouch (pouch of Douglas)* - This is a peritoneal recess located between the **rectum and the uterus**, not an extension of the vaginal lumen itself [1]. - It is the **lowest point of the peritoneal cavity** in females and can accumulate fluid. *Uterine cavity (lumen)* - This refers to the space within the **body of the uterus**, which is superior to the cervix [3]. - It is lined by the **endometrium** and is where a fertilized egg implants [2]. *Cervical canal (passage through cervix)* - The **cervical canal** is the passage that runs through the **cervix**, connecting the uterine cavity to the vagina. - It is an internal channel, not the surrounding extension of the vaginal lumen.
Question 159: Arterio-venous anastomosis is not seen in:
- A. Kidney (Correct Answer)
- B. Finger tip
- C. Ear lobule
- D. Tip of Nose
Explanation: ***Kidney*** - The kidney's primary function is **filtration and reabsorption**, which relies on a precise capillary network (glomerulus and peritubular capillaries) rather than direct arteriovenous shunting [1]. - Kidneys do NOT have **arteriovenous anastomoses (AVAs)** for thermoregulation like those present in acral and facial regions. - The renal circulation is specialized for maintaining glomerular filtration pressure and does not feature direct arteriovenous connections that bypass capillary beds [1]. *Finger tip* - The **fingertips** are rich in **arteriovenous anastomoses (AVAs)**, specifically **glomus bodies (glomera)**, which are crucial for thermoregulation. - These AVAs allow for rapid bypass of capillary beds, diverting blood away from the surface during cold exposure to conserve heat, or increasing flow during warm conditions for heat dissipation. *Ear lobule* - The **ear lobule** contains abundant **arteriovenous anastomoses** that play an important role in **thermoregulation**. - These AVAs help regulate heat loss from the body by controlling blood flow through the highly vascularized ear tissue. *Tip of Nose* - The **tip of the nose** is another classic location where **arteriovenous anastomoses (AVAs)** are abundant, serving a critical role in **thermoregulation**. - These AVAs help in rapid heat dissipation or conservation by controlling blood flow through the capillary beds of the nasal tip.
Question 160: Which vertebra is known as vertebra prominens due to its long and prominent spinous process:
- A. C2
- B. C7 (Correct Answer)
- C. T2
- D. L3
Explanation: ***C7*** - The **seventh cervical vertebra (C7)** is often referred to as the **vertebra prominens** because its spinous process is distinctly longer and more prominent than those of the other cervical vertebrae. - This prominence makes it easily **palpable** at the base of the neck, serving as a key anatomical landmark. *C2* - The spinous process of **C2 (axis)** is bifid and significantly shorter than that of C7. - While important for head rotation, its length does not compare to the palpable prominence of C7. *T2* - **Thoracic vertebrae** generally have long spinous processes that project inferiorly, but **T2's spinous process** is not the longest overall. - The processes get progressively longer moving down the thoracic spine until about T7. *L3* - **Lumbar vertebral spinous processes** are broad, thick, and relatively blunt, projecting horizontally. - While robust, the spinous process of **L3** is not as long or prominent as that of C7.
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