Lymphatic Drainage — MCQs

10 questions

Which of the following group of lymph nodes does NOT receive direct lymphatic drainage from the perineum?

What is the primary lymphatic drainage pathway of the ovary?

A 45-year-old male is diagnosed with carcinoma of the penis. Which lymph nodes should the surgeon primarily consider for potential metastasis?

Which lymph nodes drain the skin and fascia of the great toe?

Lympho-venous anastomosis is done for

Lymph vessels which drain the posterior 1/3rd of the tongue:

Which of the following cancers do not present with cervical lymph node involvement?

Which of the following statements is true regarding the saphenous opening?

Which of the following is an intra-articular tendon?

Q10

Identify the nerve passing through the Triangle of Doom:

Lymphatic Drainage Indian Medical PG Practice Questions and MCQs

Question 1: Which of the following group of lymph nodes does NOT receive direct lymphatic drainage from the perineum?

A. Superficial inguinal
B. Internal iliac
C. External iliac (Correct Answer)
D. Deep inguinal

Explanation: ***External iliac*** - The external iliac lymph nodes do **NOT receive direct lymphatic drainage** from the perineum. - They primarily receive lymph from the **deep inguinal nodes**, pelvic organs (bladder, upper vagina), and lower anterior abdominal wall [1]. - Perineal lymphatics drain to superficial inguinal, deep inguinal, or internal iliac nodes first, making external iliac a **secondary or tertiary drainage station** rather than a direct recipient. *Superficial inguinal* - These are the **primary drainage site** for lymph from the superficial perineum. - They receive direct lymphatic vessels from the **vulva, distal vagina, labia majora**, scrotum, and skin of the perineum. - This is the main first-line drainage pathway for superficial perineal structures. *Internal iliac* - Internal iliac lymph nodes receive **direct lymphatic drainage** from the deep perineum, including the **male urethra, prostate**, and deep structures [2], [3]. - They serve as primary drainage for pelvic visceral structures and deep perineal tissues [3]. *Deep inguinal* - Deep inguinal lymph nodes receive lymph from the **superficial inguinal nodes** and from deep structures of the lower limb. - They are part of the drainage pathway from the perineum via the superficial inguinal nodes.

Question 2: What is the primary lymphatic drainage pathway of the ovary?

A. Deep inguinal
B. Superficial inguinal
C. Obturator
D. Paraaortic (Correct Answer)

Explanation: ***Paraaortic*** - The **ovaries** develop embryologically in the abdominal cavity near the kidneys, and their lymphatic drainage follows the **ovarian vessels** (which arise from the aorta). - Lymph drains primarily to the **paraaortic (lumbar) lymph nodes** located along the **aorta** in the retroperitoneum at the level of L1-L2. - This is clinically important in ovarian cancer staging and treatment planning. *Deep inguinal* - The **deep inguinal lymph nodes** primarily drain the deep structures of the lower limb, perineum, and external genitalia. - They do not receive lymphatic drainage directly from the ovaries. *Superficial inguinal* - The **superficial inguinal lymph nodes** drain the skin of the lower abdomen, buttocks, perineum, external genitalia, and the superficial lower limb. - The ovaries are internal intra-abdominal organs and do not drain into these nodes. *Obturator* - The **obturator lymph nodes** are pelvic lymph nodes that primarily drain pelvic structures such as the bladder, uterine body, cervix, and upper vagina. - While adjacent to pelvic organs, they are not the primary drainage site for the ovaries, which drain superiorly along the ovarian vessels to the paraaortic nodes.

Question 3: A 45-year-old male is diagnosed with carcinoma of the penis. Which lymph nodes should the surgeon primarily consider for potential metastasis?

A. Inguinal lymph nodes (located in the groin region) (Correct Answer)
B. Para-aortic lymph nodes (located near the aorta)
C. External iliac lymph nodes (located along the external iliac vessels)
D. Internal iliac lymph nodes (located along the internal iliac vessels)

Explanation: ***Inguinal lymph nodes (located in the groin region)*** - The lymphatic drainage of the penis primarily bypasses the internal nodal basins and drains directly to the **superficial and deep inguinal lymph nodes**. - Metastasis to these nodes is the **most common initial spread** in penile carcinoma, making them the primary targets for surgical evaluation and dissection. *Para-aortic lymph nodes (located near the aorta)* - These nodes are typically involved in more advanced or widespread metastatic disease, following initial spread to the pelvic nodes. - They are not considered the primary draining lymph nodes for penile carcinoma. *External iliac lymph nodes (located along the external iliac vessels)* - While part of the pelvic lymph node chain, the external iliac nodes are usually involved after metastasis to the inguinal nodes, or in cases of direct invasion of the pelvic floor. - They are not the first echelon of lymphatic drainage for the penis. *Internal iliac lymph nodes (located along the internal iliac vessels)* - These nodes are involved in lymphatic drainage from organs like the bladder, prostate, and rectum. - The lymphatic drainage of the penis primarily bypasses these nodes for initial metastasis.

Question 4: Which lymph nodes drain the skin and fascia of the great toe?

A. Superficial inguinal lymph nodes (Correct Answer)
B. External iliac lymph nodes
C. Internal iliac lymph nodes
D. Deep inguinal lymph nodes

Explanation: ***Superficial inguinal lymph nodes*** - The **superficial inguinal lymph nodes** are responsible for draining lymph from the skin and fascia of the lower limb, including the **great toe**. [1] - They are located in the superficial fascia below the inguinal ligament and receive lymphatic vessels associated with the **great saphenous vein**. *External iliac lymph nodes* - The external iliac lymph nodes drain structures within the **pelvis** and receive lymph from the **deep inguinal lymph nodes**, not directly from the skin of the great toe. - They are located along the external iliac artery and vein. *Internal iliac lymph nodes* - The internal iliac lymph nodes primarily drain lymph from the **pelvic organs** and the **perineum**. - They do not directly receive lymphatic drainage from the great toe or the superficial lower limb. *Deep inguinal lymph nodes* - The deep inguinal lymph nodes are located deeper, medial to the **femoral vein**, and receive lymph mainly from the deep structures of the lower limb. - While they eventually drain into the external iliac nodes, they do not directly drain the superficial skin and fascia of the great toe.

Question 5: Lympho-venous anastomosis is done for

A. Cystic hygroma
B. Malignant lymphoedema
C. Lymphoid cyst
D. Filarial lymphoedema (Correct Answer)

Explanation: ***Filarial lymphoedema*** - **Lympho-venous anastomosis (LVA)** is a microsurgical technique used to bypass damaged lymphatic vessels and directly connect lymphatic channels to small veins. This procedure is primarily effective in treating **lymphedema due to lymphatic obstruction**, such as that caused by filarial infection. - In **filarial lymphoedema**, the lymphatic obstruction leads to accumulation of lymph fluid. LVA helps to restore lymphatic drainage, reducing limb swelling and improving symptoms, particularly in the early stages of the disease. *Cystic hygroma* - A **cystic hygroma** is a congenital lymphatic malformation, typically treated by surgical excision, sclerotherapy, or laser ablation. - It involves abnormally dilated lymphatic spaces and doesn't usually benefit from LVA, as the primary issue is malformation rather than obstruction requiring a bypass. *Malignant lymphoedema* - **Malignant lymphoedema** (secondary to cancer or its treatment) is often complicated by active tumor burden, radiation fibrosis, or extensive nodal involvement. - While LVA might be considered in carefully selected cases, its efficacy can be limited due to underlying cancer and the diffuse nature of the lymphatic damage, making it a less common primary indication compared to filarial lymphedema. *Lymphoid cyst* - A **lymphoid cyst** is a localized collection of lymph, often treated by aspiration, sclerotherapy, or surgical excision. - It is not a widespread lymphatic drainage disorder that would necessitate a bypass procedure like lympho-venous anastomosis.

Question 6: Lymph vessels which drain the posterior 1/3rd of the tongue:

A. Submental node
B. Submandibular node
C. Preauricular node
D. Jugulodigastric node (Correct Answer)

Explanation: ***Jugulodigastric node*** - The **jugulodigastric node** (also known as the principal node of Küttner) is a prominent deep cervical lymph node that drains lymphatic fluid directly from the **posterior 1/3rd of the tongue**. - Its strategic location at the junction of the internal jugular vein and the posterior belly of the digastric muscle makes it a primary drainage site for malignant lesions of the posterior tongue. *Submental node* - The **submental nodes** primarily drain the central part of the lower lip, the floor of the mouth, and the tip of the tongue. - They do not receive lymphatic drainage from the posterior third of the tongue. *Submandibular node* - The **submandibular nodes** drain most of the anterior two-thirds of the tongue, excluding the tip, as well as the oral cavity structures like the floor of the mouth and gingivae. - They are not the primary drainage site for the posterior third of the tongue. *Preauricular node* - **Preauricular nodes** (also known as parotid lymph nodes) are located in front of the ear and drain the temporal region, outer ear, and eyelids. - They have no direct lymphatic drainage connection to any part of the tongue.

Question 7: Which of the following cancers do not present with cervical lymph node involvement?

A. Papillary thyroid cancer
B. Oral cancer
C. Glottic Cancer (Correct Answer)
D. Subglottic Cancer

Explanation: ***Glottic Cancer*** - **Glottic cancers** rarely present with cervical lymph node involvement because the **vocal cords** have a sparse lymphatic drainage system. - This anatomical feature limits the early spread of cancer cells to regional lymph nodes, distinguishing it from other head and neck cancers. *Subglottic Cancer* - **Subglottic cancers** frequently metastasize to cervical lymph nodes, specifically the **paratracheal** and **prelaryngeal nodes**, due to a richer lymphatic network. - The disease often presents at a more advanced stage because symptoms may be subtle until significant tumor burden or nodal involvement occurs. *Papillary thyroid cancer* - **Papillary thyroid cancer** commonly metastasizes to the cervical lymph nodes, often presenting with palpable **lymphadenopathy** even with small primary tumors. - Lymphatic spread is a hallmark feature, and **central neck dissection** is frequently performed as part of the surgical treatment. *Oral cancer* - **Oral cancers** (e.g., squamous cell carcinoma of the tongue, buccal mucosa) have a high propensity for early metastasis to **cervical lymph nodes**. - The rich lymphatic drainage of the oral cavity means that cervical lymph node involvement is a significant prognostic factor and is routinely assessed during staging.

Question 8: Which of the following statements is true regarding the saphenous opening?

A. Allows passage of the Great Saphenous Vein (Correct Answer)
B. Forms an opening in the fascia
C. Covered by superficial fascia
D. Located superomedial to the pubic tubercle

Explanation: ***Allows passage of the Great Saphenous Vein*** - The saphenous opening is a gap in the **fascia lata** that allows the **great saphenous vein** to pass through and drain into the **femoral vein** [1]. - This is the **primary anatomical and clinical significance** of the saphenous opening [1]. - This anatomical arrangement is crucial for venous return from the lower limb [1]. *Located superomedial to the pubic tubercle* - This is **incorrect** - the saphenous opening is actually located **inferolateral** (not superomedial) to the pubic tubercle. - It lies approximately 3-4 cm inferolateral to the pubic tubercle, within the **femoral triangle**. *Forms an opening in the fascia* - While technically true that it is an opening in the **fascia lata**, this statement is too **vague and non-specific**. - It doesn't specify which fascia or convey the functional/clinical significance of the opening. - The more precise answer identifies its primary function (passage of the great saphenous vein). *Covered by superficial fascia* - This is **misleading** - the saphenous opening is covered by the **cribriform fascia**, which is a specialized, perforated modification of the superficial fascia. - Saying it's simply "covered by superficial fascia" doesn't capture the specific anatomical structure (cribriform fascia) that fills this opening.

Question 9: Which of the following is an intra-articular tendon?

A. Anconeus
B. Semitendinosus
C. Popliteus (Correct Answer)
D. Sartorius

Explanation: ***Popliteus*** - The **popliteus tendon** originates within the knee capsule (intra-articular) before emerging to insert onto the posterior tibia. - It plays a crucial role in **unlocking the knee joint** from full extension and contributes to posterior stability. *Anconeus* - The **anconeus muscle** is located on the posterior aspect of the elbow, extending from the lateral epicondyle of the humerus to the ulna. - It is an **extra-articular muscle** that assists in elbow extension and stabilization. *Semitendinosus* - The **semitendinosus** is one of the hamstring muscles, located in the posterior thigh. - Its tendon contributes to the **pes anserinus**, inserting on the medial aspect of the tibia distal to the knee joint, making it an extra-articular tendon. *Sartorius* - The **sartorius** is the longest muscle in the body, running obliquely across the anterior aspect of the thigh. - Its tendon also contributes to the **pes anserinus**, inserting medially to the knee joint, and is considered extra-articular.

Question 10: Identify the nerve passing through the Triangle of Doom:

A. Genital branch of genitofemoral nerve
B. Femoral branch of genitofemoral nerve (Correct Answer)
C. Ilio-inguinal nerve
D. Lateral femoral cutaneous nerve

Explanation: ***Femoral branch of genitofemoral nerve*** - The **Triangle of Doom** is an inverted triangle located inferior to the deep inguinal ring, bounded by the **vas deferens medially** and the **gonadal vessels laterally**. - The **femoral branch of genitofemoral nerve** courses along the **external iliac artery** and passes through or immediately adjacent to the Triangle of Doom. - This nerve is at significant risk during laparoscopic inguinal hernia repair when dissecting within this triangle, making it a critical landmark. - Injury can result in sensory loss over the anterior thigh. *Lateral femoral cutaneous nerve* - The **lateral femoral cutaneous nerve** runs **lateral to the Triangle of Doom**, passing under the lateral aspect of the inguinal ligament near the anterior superior iliac spine. - It does NOT pass through the Triangle of Doom itself. - It provides sensation to the lateral thigh and can be injured during lateral dissection, but is not within the triangle's boundaries. *Genital branch of genitofemoral nerve* - The **genital branch of genitofemoral nerve** courses through the **inguinal canal** alongside the spermatic cord. - It innervates the cremaster muscle and scrotal skin. - It lies more anterior and medial, within the inguinal canal rather than in the Triangle of Doom. *Ilio-inguinal nerve* - The **ilio-inguinal nerve** runs within the inguinal canal parallel to the spermatic cord. - It provides sensation to the groin, perineum, and inner thigh. - It is located superficial to the deep inguinal ring and anterior to the Triangle of Doom structures.

Want unlimited practice?

Get full access to all questions, explanations, and performance tracking.

Start For Free