Systemic Anatomy — MCQs

Systemic Anatomy Indian Medical PG Practice Questions and MCQs

Question 371: The duct of Wirsung is:

A. Parotid duct.
B. Common bile duct
C. Main Pancreatic duct (Correct Answer)
D. Accessory Pancreatic duct

Explanation: ***Main Pancreatic duct*** - The **duct of Wirsung** is the primary duct that drains **pancreatic exocrine secretions** (digestive enzymes and bicarbonate) from the pancreas into the duodenum [1]. - It typically joins the **common bile duct** to form the **ampulla of Vater**, which then empties into the second part of the duodenum [3]. *Parotid duct* - The **parotid duct** (Stensen's duct) drains secretions from the **parotid salivary gland**. - It opens into the buccal mucosa opposite the second maxillary molar tooth, not related to the pancreas. *Common bile duct* - The **common bile duct** is formed by the union of the **common hepatic duct** and the **cystic duct**, carrying bile from the liver and gallbladder [2]. - While it often merges with the main pancreatic duct before entering the duodenum, it is not the duct of Wirsung itself. *Accessory Pancreatic duct* - The **accessory pancreatic duct** (duct of Santorini) is a smaller duct that drains a portion of the head of the pancreas directly into the duodenum. - It is present in many individuals but is distinct from the main pancreatic duct (Wirsung) and often has a separate opening proximal to the ampulla of Vater.

Question 372: All of the following are branches of the external carotid artery except?

A. Superior thyroid artery
B. Transverse cervical artery (Correct Answer)
C. Ascending pharyngeal artery
D. Superficial temporal artery

Explanation: ***Transverse cervical artery*** - The **transverse cervical artery** is a branch of the **thyrocervical trunk**, which itself originates from the **subclavian artery**, not the external carotid artery. - It supplies muscles in the neck and shoulder region. *Superior thyroid artery* - The **superior thyroid artery** is typically the first branch of the **external carotid artery**. - It supplies the **thyroid gland** and adjacent structures in the neck. *Ascending pharyngeal artery* - The **ascending pharyngeal artery** is the only **medial branch** of the **external carotid artery**. - It supplies the **pharynx**, prevertebral muscles, and middle ear. *Superficial temporal artery* - The **superficial temporal artery** is one of the **two terminal branches** of the **external carotid artery**, forming in the parotid gland. - It supplies the scalp in the temporal region and is palpable anterior to the ear.

Question 373: Which of the following are components of Waldeyer's ring?

A. The tonsil
B. All of the above (Correct Answer)
C. The lingual tonsil
D. The adenoid

Explanation: ***All of the above*** - **Waldeyer's ring** is a ring of lymphoid tissue surrounding the pharynx, guarding the entrance to the upper aerodigestive tract - It consists of **four main components**: the pharyngeal tonsil (adenoid), paired palatine tonsils, paired tubal tonsils, and lingual tonsil - All three options listed (palatine tonsil, lingual tonsil, and adenoid) are **integral components** of this protective lymphoid ring - This ring provides **immunological protection** at the entrance of the respiratory and digestive systems *The tonsil* - This term typically refers to the **palatine tonsils**, which are located between the palatoglossal and palatopharyngeal arches - While palatine tonsils are indeed a **major component** of Waldeyer's ring, this option alone is **incomplete** as it excludes the other components *The lingual tonsil* - Located at the **posterior third of the tongue** (base of tongue) - Forms the **inferior portion** of Waldeyer's ring - This option is **correct but incomplete** as it represents only one component of the ring *The adenoid* - Also known as the **pharyngeal tonsil**, located in the **roof of the nasopharynx** - Forms the **superior portion** of Waldeyer's ring - This option is **correct but incomplete** as it represents only one component of the ring

Question 374: In which anatomical structure is Killian's dehiscence observed?

A. Superior constrictor
B. Inferior constrictor (Correct Answer)
C. Middle constrictor
D. Stylopharyngeus

Explanation: ***Inferior constrictor*** - Killian's dehiscence is a triangular area of muscular weakness located in the posterior pharyngeal wall, specifically between the **thyropharyngeus** and **cricopharyngeus** parts of the inferior constrictor muscle. - This anatomical weakness is a common site for the formation of **Zenker's diverticulum** (posterior pharyngeal diverticulum). *Superior constrictor* - The superior constrictor muscle is located higher in the pharynx, forming the posterior and lateral walls of the **nasopharynx** and **oropharynx**. - Its weakness would not lead to Killian's dehiscence, which arises from the **hypopharynx**. *Middle constrictor* - The middle constrictor muscle is situated between the superior and inferior constrictor muscles, originating from the **hyoid bone**. - This muscle is not associated with the specific area of weakness known as Killian's dehiscence. *Stylopharyngeus* - The stylopharyngeus is a longitudinal muscle of the pharynx that passes between the superior and middle constrictors to insert into the pharyngeal wall. - It is not a constrictor muscle and is not associated with Killian's dehiscence, which occurs specifically in the **inferior constrictor**.

Question 375: Thoracic duct terminates at the junction of which veins?

A. External jugular vein and subclavian vein
B. Internal jugular vein and subclavian vein (Correct Answer)
C. External jugular vein and brachiocephalic vein
D. Internal jugular vein and brachiocephalic vein

Explanation: ***Internal jugular vein and subclavian vein*** - The **thoracic duct** is the largest lymphatic vessel in the body, draining lymph from most of the body [1]. - It typically terminates at the junction of the **left internal jugular vein** and the **left subclavian vein**, which together form the left brachiocephalic vein [1]. *External jugular vein and subclavian vein* - The **external jugular vein** drains superficial structures of the head and neck and typically empties into the subclavian vein, but it is not the classic termination point for the thoracic duct. - While the **subclavian vein** is involved, the specific conjunction with the external jugular is incorrect for thoracic duct termination. *External jugular vein and brachiocephalic vein* - The **brachiocephalic vein** itself is formed by the union of the internal jugular and subclavian veins, so stating it as a junction partner with the external jugular vein is anatomically inaccurate. - The **external jugular vein** drains into the subclavian vein, not directly with the brachiocephalic vein. *Internal jugular vein and brachiocephalic vein* - The **brachiocephalic vein** is the venous trunk formed by the union of the internal jugular and subclavian veins. - Therefore, the thoracic duct terminates *at the junction of* the **internal jugular** and **subclavian veins**, not where the internal jugular meets the brachiocephalic vein itself.

Question 376: All of the following are true of the maxillary artery except:

A. It is the arterial supply for mandible
B. It is one of the terminal branches of ECA
C. The branches of maxillary artery accompany the branches of maxillary nerve
D. It passes deep between the two heads of lateral pterygoid muscle into the pterygopalatine fossa (Correct Answer)

Explanation: ***It passes deep between the two heads of lateral pterygoid muscle into the pterygo palatine fossa*** - The maxillary artery typically passes either **superficial or deep to the inferior head of the lateral pterygoid muscle** (occasionally between the two heads), not routinely deep between the two heads, to enter the pterygopalatine fossa. - The most common anatomical variation places it **superficial (lateral) to the lateral pterygoid muscle**, though a deep course (medial to the muscle) also occurs. *It is the arterial supply for mandible* - The **inferior alveolar artery**, a branch of the maxillary artery, provides the primary blood supply to the mandible and its teeth. - Therefore, the maxillary artery does indeed contribute significantly to the arterial supply of the mandible through its branches. *It is one of the terminal branches of ECA* - The maxillary artery is one of the two **terminal branches of the external carotid artery (ECA)**, along with the superficial temporal artery. - It originates within the parotid gland and then courses anteriorly. *The branches of maxillary artery accompany the branches of maxillary nerve* - In the pterygopalatine fossa, the branches of the maxillary artery often course alongside the branches of the **maxillary nerve (CN V2)**. - For example, the **infraorbital artery** accompanies the **infraorbital nerve**, and the **nasopalatine artery** follows the **nasopalatine nerve**.

Question 377: Brachiocephalic vein is formed by which of the following?

A. Internal jugular vein and retromandibular vein.
B. External jugular vein and retromandibular vein.
C. External jugular vein and subclavian vein.
D. Internal jugular vein and subclavian vein. (Correct Answer)

Explanation: ***Internal jugular vein and subclavian vein.*** - The **brachiocephalic vein** (also known as the innominate vein) is formed by the union of the **internal jugular vein** and the **subclavian vein**. - This anatomical confluence occurs bilaterally behind the sternoclavicular joint and is a critical part of the venous drainage of the head, neck, and upper limbs. *External jugular vein and subclavian vein.* - The **external jugular vein** drains superficial structures of the head and neck and typically empties into the subclavian vein, not directly forming the brachiocephalic vein. - This combination does not form the brachiocephalic vein, as the internal jugular vein is the major tributary required. *Internal jugular vein and retromandibular vein.* - The **internal jugular vein** is a major tributary of the brachiocephalic vein, but the **retromandibular vein** primarily drains the face and parotid gland. - The retromandibular vein typically terminates by dividing into anterior and posterior divisions, with the posterior division joining the posterior auricular vein to form the external jugular. *External jugular vein and retromandibular vein.* - The **external jugular vein** and **retromandibular vein** do not directly form the brachiocephalic vein. - The retromandibular vein contributes to the formation of the external jugular vein, which then drains into the subclavian vein.

Question 378: Which artery supplies the ductus deferens?

A. Deferential artery (Correct Answer)
B. Cremasteric artery
C. Inferior epigastric artery
D. Vesical artery

Explanation: ***Deferential artery*** - The **deferential artery** is the primary blood supply to the **ductus deferens**. It typically originates from the **superior or inferior vesical artery**. - This artery runs alongside the ductus deferens within the **spermatic cord**, providing arterial branches throughout its length. *Cremasteric artery* - The **cremasteric artery** primarily supplies the **cremaster muscle** and the fascial coverings of the spermatic cord [1]. - While it traverses the spermatic cord, it does not directly supply the ductus deferens itself. *Inferior epigastric artery* - The **inferior epigastric artery** supplies the **anterior abdominal wall muscles** and skin [1]. - It does not directly supply the ductus deferens but gives rise to the **cremasteric artery** as one of its branches [1]. *Vesical artery* - The **vesical arteries** (superior and inferior) primarily supply the **urinary bladder**. - While the deferential artery often originates from a vesical artery, "vesical artery" itself is not the direct and specific supply to the ductus deferens.

Question 379: Which of the following statements is true about the diaphragm's anatomy?

A. The left side of the diaphragm is significantly pushed down by the heart.
B. The right side of the diaphragm is lower than the left side.
C. The liver pushes the right side of the diaphragm upward, making it higher than the left side. (Correct Answer)
D. Hernias are more common on the right side due to structural weaknesses.

Explanation: ***The liver pushes the right side of the diaphragm upward, making it higher than the left side.*** - The **large mass of the liver**, located beneath the right hemidiaphragm, elevates it. - This anatomical arrangement results in the **right dome of the diaphragm** being typically ½ to 1 inch higher than the left. *The left side of the diaphragm is significantly pushed down by the heart.* - While the heart rests on the **central tendon** of the diaphragm, its primary effect is not to significantly push down the left hemidiaphragm to make it lower than the right. - The heart's position influences the central tendon and left dome, but the **liver's position** on the right is the dominant factor in hemidiaphragm height. *Hernias are more common on the right side due to structural weaknesses.* - This statement is **incorrect**; **diaphragmatic hernias**, particularly congenital ones like **Bochdalek hernias**, are actually more common on the **left side** (80-90% of cases). - This left-sided predisposition is due to the **earlier closure of the right pleuroperitoneal canal** during embryological development, making the left side more susceptible to persistent defects. *The right side of the diaphragm is lower than the left side.* - This statement is incorrect; the **right side is typically higher** than the left. - The presence of the **liver** beneath the right hemidiaphragm accounts for this elevated position.

Question 380: In which area of the abdomen is the hypogastric region located?

A. The upper central abdomen directly below the xiphoid
B. The right upper quadrant
C. The left upper quadrant
D. The area below the umbilicus and above the pubic region (Correct Answer)

Explanation: ***The area below the umbilicus and above the pubic region*** - The **hypogastric region** is the central abdominal area located between the umbilicus and the pubic bone. [1] - This region is also known as the **suprapubic region** and often contains portions of the bladder, uterus (in females), and small intestine. [1] *The upper central abdomen directly below the xiphoid* - This description corresponds to the **epigastric region**, which is superior to the umbilical region. - Organs located here include the stomach, liver, and pancreas. *The right upper quadrant* - This quadrant contains organs such as the **liver**, **gallbladder**, and parts of the small and large intestines. - It is located on the right side of the upper abdomen, lateral to the epigastric region. *The left upper quadrant* - This quadrant contains organs such as the **spleen**, **stomach**, and parts of the small and large intestines. - It is located on the left side of the upper abdomen, lateral to the epigastric region.

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