Systemic Anatomy

Systemic Anatomy Indian Medical PG Question 1: Match List-I with List-II and select the correct answer using the code given below the Lists:

• A. A→1 B→2 C→4 D→3
• B. A→3 B→2 C→4 D→1
• C. A→3 B→4 C→2 D→1 (Correct Answer)
• D. A→1 B→4 C→2 D→3

Systemic Anatomy Explanation: ***Correct Answer: A→3, B→4, C→2, D→1*** **Understanding Health Education Methods:** **A. Symposium → 3. Series of speeches** - A symposium is a formal meeting where multiple experts deliver **sequential speeches** on different aspects of a selected subject - Each speaker presents their perspective, typically without much interaction between speakers during the presentation **B. Panel Discussion → 4. Discussion among the speakers** - A panel involves **interactive discussion among panelists** (experts) on a particular topic - Characterized by dialogue and exchange of views between speakers, often followed by audience questions **C. Workshop → 2. Arriving at a plan of action** - A workshop is a **participatory, problem-solving session** designed to achieve practical outcomes - Participants actively engage in exercises and activities to develop concrete action plans or solutions **D. Role-play → 1. Dramatizing a situation** - Role-play involves **acting out scenarios** to experience different perspectives - Participants assume roles and dramatize situations to understand behaviors, emotions, and decision-making processes *Key Differentiation:* - Symposium = One-way presentations (speakers → audience) - Panel = Two-way discussion (speakers ↔ speakers) - Workshop = Participatory action planning - Role-play = Experiential learning through dramatization

Systemic Anatomy Indian Medical PG Question 2: Which of the following is the platinum-based chemotherapeutic agent used as first-line treatment for ovarian carcinoma?

• A. Cyclophosphamide
• B. Methotrexate
• C. Cisplatin (Correct Answer)
• D. Dacarbazine

Systemic Anatomy Explanation: ***Cisplatin*** - **Cisplatin** is a platinum-based chemotherapy drug that forms **DNA cross-links**, inhibiting DNA synthesis and leading to the death of rapidly dividing cells, making it highly effective against **ovarian carcinoma**. - It is a cornerstone of chemotherapy regimens for ovarian cancer, often used in combination with other agents such as paclitaxel. *Methotrexate* - **Methotrexate** is an **antimetabolite** that inhibits dihydrofolate reductase, thereby interfering with DNA synthesis. - While it is used in various cancers like leukemia, lymphoma, and some solid tumors (e.g., breast cancer, gestational trophoblastic disease), it is **not a primary recommended drug for ovarian carcinoma**. *Cyclophosphamide* - **Cyclophosphamide** is an **alkylating agent** that causes DNA damage, leading to cell death. - It is used in many cancers, including lymphoma, breast cancer, and some leukemias, but it is **not a first-line or primary agent for ovarian carcinoma** in contemporary treatment guidelines. *Dacarbazine* - **Dacarbazine** is an **alkylating agent** primarily used in the treatment of **malignant melanoma** and Hodgkin lymphoma. - It is **not indicated for the treatment of ovarian carcinoma**.

Systemic Anatomy Indian Medical PG Question 3: A study was conducted to evaluate the diagnostic accuracy of ECG for detecting myocardial infarction. The results are shown in the 2x2 table below: Myocardial Infarction Present Absent Total ECG Positive 45 8,000 8,045 ECG Negative 5 32,000 32,005 Total 50 40,000 40,050 Consider the following statements: I. Sensitivity is 90%. II. Specificity is 80%. Which of the statements given above is/are correct?

• A. Both I and II (Correct Answer)
• B. Neither I nor II
• C. II only
• D. I only

Systemic Anatomy Explanation: **Both I and II** - **Sensitivity** = True Positives / (True Positives + False Negatives) = 45 / (45 + 5) = 45/50 = **0.90 or 90%** ✓ - **Specificity** = True Negatives / (True Negatives + False Positives) = 32,000 / (32,000 + 8,000) = 32,000/40,000 = **0.80 or 80%** ✓ - Both calculations are correct based on the 2×2 contingency table - **Sensitivity** measures the ability of the test to correctly identify those with disease (true positive rate) - **Specificity** measures the ability of the test to correctly identify those without disease (true negative rate) *I only* - Incorrect because Statement II (Specificity = 80%) is also correct, not just Statement I *II only* - Incorrect because Statement I (Sensitivity = 90%) is also correct, not just Statement II *Neither I nor II* - Incorrect because both statements are mathematically correct based on the given data

Systemic Anatomy Indian Medical PG Question 4: The organ with maximum blood flow in milliliters per kilogram per minute during resting is:

• A. Kidneys (Correct Answer)
• B. Brain
• C. Lungs
• D. Liver

Systemic Anatomy Explanation: ***Kidneys*** - The kidneys receive a disproportionately large share of cardiac output, approximately **20-25%**, which is essential for their role in **filtering blood** and maintaining fluid and electrolyte balance. - When adjusted for organ weight, the kidneys have the highest blood flow per unit mass due to their high metabolic demands for active transport and regulatory functions. *Liver* - The liver receives significant blood flow, but a substantial portion is **venous blood** from the portal system, which is lower in oxygen and nutrient content. - While total blood flow to the liver is high, its actual arterial supply and overall perfusion density per kilogram is lower than that of the kidneys. *Brain* - The brain has high metabolic demands and receives a constant and significant blood supply, typically around **15% of cardiac output**, to ensure adequate oxygen and glucose delivery. - However, when normalized per unit of tissue mass, its blood flow is less than that of the kidneys, which have specialized functions requiring extremely high perfusion. *Lungs* - The lungs receive the entire cardiac output through the **pulmonary circulation** for gas exchange, but this refers to the total volume of blood passing through, not the nutritive arterial supply to the lung tissue itself. - The bronchial circulation, which supplies oxygenated blood to the lung tissue, is relatively small compared to other highly metabolic organs.

Systemic Anatomy Indian Medical PG Question 5: What is the primary function of the superior cervical ganglion?

• A. Is the largest cervical ganglion
• B. Supplies sympathetic fibers to the dilator pupillae muscle (Correct Answer)
• C. Deep petrosal nerve of pterygopalatine ganglion is derived from plexus around internal carotid artery
• D. Left superior cervical cardiac branch goes to deep cardiac plexus

Systemic Anatomy Explanation: Supplies sympathetic fibers to the dilator pupillae muscle - The superior cervical ganglion is the primary source of postganglionic sympathetic fibers to the head and neck. - One of its key functions is providing sympathetic innervation to the dilator pupillae muscle [1] via the long ciliary nerves, causing mydriasis (pupil dilation) [2]. - This represents a clear physiological function of the ganglion in autonomic control of the eye. Is the largest cervical ganglion - While the superior cervical ganglion is indeed the largest of the three cervical sympathetic ganglia, this is an anatomical characteristic, not a function. - Size is a structural feature, not a physiological role. Left superior cervical cardiac branch goes to deep cardiac plexus - The superior cervical ganglion does contribute cardiac branches to the cardiac plexus for sympathetic innervation of the heart. - However, this describes an anatomical pathway rather than the primary function itself, and specifying "left" and "deep cardiac plexus" makes it overly specific rather than addressing overall function. Deep petrosal nerve of pterygopalatine ganglion is derived from plexus around internal carotid artery - The superior cervical ganglion does send postganglionic fibers forming a plexus around the internal carotid artery, which contributes to the deep petrosal nerve. - However, this is an anatomical derivation/pathway, not a functional description of what the ganglion does physiologically.

Systemic Anatomy Indian Medical PG Question 6: An MRI of a patient with low back pain reveals compression of the L5 nerve root. Which of the following muscles would most likely show weakness during physical examination?

• A. Tibialis posterior
• B. Tibialis anterior (Correct Answer)
• C. Gastrocnemius
• D. Quadriceps femoris

Systemic Anatomy Explanation: ***Tibialis anterior*** - The **L5 nerve root** primarily innervates muscles responsible for **dorsiflexion** of the foot, with the **tibialis anterior** being the primary dorsiflexor. - Weakness of the tibialis anterior would manifest as difficulty lifting the front of the foot, potentially leading to a **foot drop** gait. *Tibialis posterior* - The **tibialis posterior** is primarily innervated by the **tibial nerve** (S1-S2) and is responsible for **plantarflexion** and **inversion** of the foot. - Weakness in this muscle would not be the most likely presentation of L5 nerve root compression. *Gastrocnemius* - The **gastrocnemius** muscle is primarily innervated by the **tibial nerve** (S1-S2) and is a powerful **plantarflexor** of the foot. - Weakness in this muscle would indicate an S1 or S2 nerve root issue, not typically L5. *Quadriceps femoris* - The **quadriceps femoris** is innervated by the **femoral nerve**, predominantly originating from the **L2, L3, and L4 nerve roots**. - Weakness would manifest as difficulty extending the knee, which is not characteristic of L5 compression.

Systemic Anatomy Indian Medical PG Question 7: The right coronary artery supplies all except:

• A. Posterior part of interventricular septum
• B. SA node
• C. Anterior interventricular groove (Correct Answer)
• D. Right atrium

Systemic Anatomy Explanation: ***Anterior interventricular groove*** - The **anterior interventricular groove** contains the **anterior interventricular artery** (also known as the **left anterior descending artery**), which is a branch of the **left coronary artery**. [1] - Therefore, the **right coronary artery does NOT supply** structures located in the anterior interventricular groove. - This is the correct answer for this "except" question. *Posterior part of interventricular septum* - In most individuals (around **85%**), the **right coronary artery** gives rise to the **posterior descending artery (PDA)**. - The PDA supplies the **posterior one-third of the interventricular septum** and the inferior wall of both ventricles. - The RCA **does supply** this structure. *SA node* - The **sinoatrial (SA) node**, the natural pacemaker of the heart, is supplied by the **right coronary artery** in about **60%** of individuals. - In the remaining 40%, it is supplied by the left circumflex artery, but the RCA is the predominant supplier. - The RCA **does supply** this structure in most cases. *Right atrium* - The **right coronary artery (RCA)** gives off branches that supply the **right atrium**. - This is a direct supply that helps maintain the function of the right heart chamber. - The RCA **does supply** this structure.

Systemic Anatomy Indian Medical PG Question 8: Which myocardial region is most likely to experience ischemia following occlusion of the left anterior descending artery?

• A. Left atrium
• B. Right ventricle
• C. Interatrial septum
• D. Anterior wall (Correct Answer)

Systemic Anatomy Explanation: **Anterior wall** - The **left anterior descending (LAD) artery** is a major coronary artery that supplies blood to the **anterior two-thirds of the interventricular septum** and the **anterior wall of the left ventricle**. - Occlusion of the LAD artery, often referred to as the "**widowmaker**," leads to significant ischemia and infarction in these regions due to loss of blood supply [1]. *Left atrium* - The **left atrium** is primarily supplied by branches of the **circumflex artery** and occasionally by the right coronary artery. - Involvement of the left atrium is highly unlikely with isolated LAD occlusion. *Right ventricle* - The **right ventricle** is predominantly supplied by the **right coronary artery (RCA)**. - While there can be some collateral flow, isolated LAD occlusion typically spares the right ventricle. *Interatrial septum* - The **interatrial septum** receives blood supply from branches of both the **right and left coronary arteries**, but mainly from the **right coronary artery**. - Ischemia in this region is uncommon with LAD occlusion, which primarily affects the ventricular septum.

Systemic Anatomy Indian Medical PG Question 9: All of the following organs develop in the mesentery of the stomach except for which of the following?

• A. Liver and gallbladder
• B. Spleen and pancreas
• C. Kidney (Correct Answer)
• D. None of the options

Systemic Anatomy Explanation: ***Kidney*** - The **kidneys** develop in the **retroperitoneal space** [2], external to the peritoneal cavity and not within the mesentery of the stomach. - Their development is distinct from the foregut derivatives and associated mesenteries. *Liver and gallbladder* - The **liver** and **gallbladder** develop as outgrowths from the **foregut endoderm** within the ventral mesentery of the stomach [1]. - They remain connected to the stomach by the lesser omentum, which is derived from the ventral mesentery [1]. *Spleen and pancreas* - The **spleen** develops within the **dorsal mesentery** of the stomach. - The **pancreas** develops from both ventral and dorsal buds; the dorsal bud forms in the **dorsal mesentery** and the ventral bud in the **ventral mesentery** [1]. *None of the options* - This option is incorrect because the **kidney** is the correct answer; it does not develop from the mesentery of the stomach.

Systemic Anatomy Indian Medical PG Question 10: Which of the following is not a derivative of foregut?

• A. Cecum (Correct Answer)
• B. Liver
• C. Pancreas
• D. First part of the duodenum

Systemic Anatomy Explanation: ***Cecum*** - The **cecum** and the entire large intestine (except the distal third of the transverse colon) are derivatives of the **midgut** [1]. - The midgut is supplied by the **superior mesenteric artery**, differentiating it developmentally from the foregut. *First part of the duodenum* - The **first part of the duodenum** (from the pylorus to the major duodenal papilla) is derived from the **foregut**. - This section receives its blood supply from branches of the **celiac trunk**, consistent with its foregut origin. *Liver* - The **liver** develops as a budding from the distal foregut and is therefore a **foregut derivative** [2]. - It plays a crucial role in metabolism and detoxification, consistent with its early development from this segment. *Pancreas* - The **pancreas** develops from dorsal and ventral buds of the distal foregut, making it a **foregut derivative**. - Both its exocrine and endocrine functions are vital for digestion and glucose homeostasis.

Systemic Anatomy Flashcard 1 of 10

Question: The anterior interventricular artery is a branch of the _____ coronary artery.

Answer: left

Systemic Anatomy Flashcard 2 of 10

Question: Baroreceptors are stretch mechanoreceptors located within the _____ and the aortic arch

Answer: carotid sinus

Systemic Anatomy Flashcard 3 of 10

Question: The renal arteries are end arteries _____ collateral circulation.

Answer: without (with/without)

Systemic Anatomy Flashcard 4 of 10

Question: 02e5c29843e54358a5e699ba86f6212a-ao-2

Answer:

Extra Information: 

Systemic Anatomy Flashcard 5 of 10

Question: The medullary pyramids (papillae) of the kidney empty into _____ and minor calyces

Answer: major

Systemic Anatomy Flashcard 6 of 10

Question: An example of triangular oblique muscle is _____, temporalis and adductor longus

Answer: trapezius

Systemic Anatomy Flashcard 7 of 10

Question: An example of fusiform parellel muscle is _____ and digastric

Answer: biceps brachii

Systemic Anatomy Flashcard 8 of 10

Question: _____ long bones have an elongated shaft (diaphysis) and two expanded ends (epiphysis).

Answer: Typical

Systemic Anatomy Flashcard 9 of 10

Question: In the _____ nephrons, the peritubular capillaries give off vasa recta (straight arterioles) which run parallel to the loop of Henle

Answer: juxtamedullary

Systemic Anatomy Flashcard 10 of 10

Question: There are three constrictions of the ureter:1 - _____ junction2 - at the Pelvic inlet3 - Ureterovesical junction

Answer: Ureteropelvic