Back Practice Questions

Q: The Artery of Adamkiewicz is related to which of the following structures?

Spinal Cord. **Explanation:** The **Artery of Adamkiewicz**, also known as the *arteria radicularis magna* (great anterior radicular artery), is the largest and most important segmental artery supplying the **spinal cord**. It typically arises from a left-sided posterior intercostal artery (usually between T9 and L2) and provides the primary blood supply to the lower two-thirds of the anterior spinal artery, which nourishes the motor tracts of the spinal cord. **Why the other options are incorrect:** * **Hand:** The hand is primarily supplied by the radial and ulnar arteries, forming the superficial and deep palmar arches. * **Penis:** The blood supply to the penis is derived from the internal pudendal artery (branches include the dorsal artery and deep artery of the penis). * **Brain:** The brain is supplied by the internal carotid arteries and the vertebral arteries, which form the Circle of Willis. **Clinical Pearls for NEET-PG:** * **Vulnerability:** Because it is often the sole major supply to the lower spinal cord, injury or occlusion of this artery (e.g., during abdominal aortic aneurysm repair or spinal surgery) can lead to **Anterior Spinal Artery Syndrome**. * **Clinical Presentation:** Ischemia results in sudden paraplegia and loss of pain/temperature sensation, while proprioception and vibration (dorsal columns) remain intact. * **Origin:** In 80% of individuals, it arises on the **left side** between the levels of **T9 and L2**.

Q: Which of the following is NOT true about the iliolumbar ligament?

Its lower part is attached to the sacrospinous ligament.. The **iliolumbar ligament** is a strong, dense band of connective tissue that plays a critical role in stabilizing the lumbosacral junction. ### **Explanation of the Correct Answer (Option B)** Option B is **incorrect** (and thus the correct answer to the "NOT true" question) because the lower part of the iliolumbar ligament is attached to the **anterior part of the lateral mass of the sacrum** (ala of the sacrum), where it blends with the **anterior sacroiliac ligament**. It has no direct anatomical attachment to the sacrospinous ligament, which is located much lower in the pelvis, extending from the ischial spine to the sacrum/coccyx. ### **Analysis of Other Options** * **Option A:** True. The ligament typically originates from the tip of the **transverse process of the L5 vertebra**, but it frequently receives an additional superior band from the **L4 transverse process**. * **Option C:** True. The ligament fans out laterally to attach to the **inner lip of the posterior iliac crest**. * **Option D:** True. The iliolumbar ligament is continuous superiorly with the **anterior layer of the thoracolumbar fascia**, which covers the quadratus lumborum muscle. ### **High-Yield Clinical Pearls for NEET-PG** * **Function:** It is the primary stabilizer of the L5-S1 joint, preventing the forward sliding (spondylolisthesis) of the L5 vertebra over the sacrum. * **Morphology:** It is considered the "degenerated" remains of the lower portion of the **quadratus lumborum** muscle. * **Clinical Significance:** Iliolumbar syndrome (Iliolumbar ligament sprain) is a common cause of referred low back pain, often presenting with tenderness at the iliac crest.

Q: A 39-year-old male presents with severe neck pain after a whiplash injury, sustained when his car was struck from behind. Radiographic studies reveal trauma to the ligament lying on the anterior surface of the cervical vertebral bodies. Which ligament is this?

Anterior longitudinal ligament. **Explanation:** The correct answer is **Anterior Longitudinal Ligament (ALL)**. **1. Why the Correct Answer is Right:** The **Anterior Longitudinal Ligament** is a strong, fibrous band that covers and connects the anterior aspects of the vertebral bodies and intervertebral discs. It extends from the pelvic surface of the sacrum to the anterior tubercle of vertebra C1 and the occipital bone. Its primary biomechanical function is to **limit extension** of the vertebral column. In a whiplash injury (hyperextension of the neck), the ALL is the only ligament stretched or torn, making it the most likely structure damaged in this clinical scenario. **2. Why the Incorrect Options are Wrong:** * **Ligamentum Flavum:** These connect the laminae of adjacent vertebrae. They are located within the vertebral canal and are stretched during flexion, not extension. * **Nuchal Ligament:** This is a membrane-like expansion of the supraspinous ligament in the cervical region. It attaches to the spinous processes and the external occipital protuberance; it limits flexion. * **Posterior Longitudinal Ligament (PLL):** This ligament runs along the **posterior** surface of the vertebral bodies (inside the vertebral canal). It helps prevent hyperflexion and posterior disc herniation but is not located on the anterior surface. **3. NEET-PG High-Yield Pearls:** * **Whiplash Injury:** Classically involves **hyperextension** followed by rebound flexion. The ALL is the primary structure injured during the hyperextension phase. * **ALL vs. PLL:** The ALL is wide and strong (prevents hyperextension), while the PLL is narrower and weaker (prevents hyperflexion). * **Ligamentum Flavum:** High elastic content (yellowish appearance) helps maintain upright posture and prevents abrupt flexion. * **Cruciate Ligament of Atlas:** Consists of the transverse ligament of the atlas and longitudinal bands; vital for atlanto-axial stability.

Q: Which of the following is FALSE about Luschka joints?

Cervical nerve roots pass posteromedial to these joints.. ### Explanation **Luschka joints**, also known as **Uncovertebral joints**, are unique anatomical structures found in the cervical spine (C3 to C7). Understanding their relations is high-yield for clinical anatomy. **1. Why Option D is the Correct (False) Statement:** The cervical nerve roots do not pass posteromedial to these joints; instead, they pass **posterolateral** to the Luschka joints. The joint forms the anterior wall of the intervertebral foramen. Therefore, any hypertrophy or osteophyte formation at this joint directly encroaches upon the nerve root from an anterior direction [1]. **2. Analysis of Other Options:** * **Option A (True):** These are synovial-like joints formed between the **uncinate processes** (upward projections on the lateral margins of the lower vertebral body) and the beveled surface of the vertebral body above. * **Option B (True):** These joints are frequent sites of degenerative changes. **Osteophyte formation** (bony spurs) is a hallmark of cervical spondylosis at this location [1]. * **Option C (True):** The **vertebral artery** ascends in the transverse foramen, which lies immediately lateral to the Luschka joints. Medial projection of osteophytes can compress the artery, leading to **vertebrobasilar insufficiency** (dizziness or syncope upon neck rotation). ### High-Yield NEET-PG Pearls: * **Location:** Only found in the **Cervical region (C3–C7)**. They are absent in thoracic and lumbar vertebrae. * **Type:** They are considered "pseudo-joints" or modified synovial joints. * **Clinical Significance:** They are the most common site for osteophyte formation in the cervical spine, leading to: 1. **Radiculopathy:** Due to compression of the exiting nerve root (posterolateral relation) [1]. 2. **Vascular symptoms:** Due to compression of the vertebral artery (lateral relation).

Q: Which joint movement permits a person to look towards the right or left?

Atlanto-axial joint. The movement of looking towards the right or left is **rotation**, which occurs primarily at the **Atlanto-axial joint (C1-C2)**. ### **Explanation of the Correct Answer** The Atlanto-axial joint is a complex of three synovial joints: one median pivot joint (between the dens of C2 and the anterior arch of C1) and two lateral plane joints. The **median pivot joint** is specifically designed for rotation. When you turn your head to say "No," the atlas (C1) rotates around the dens (odontoid process) of the axis (C2). This joint accounts for approximately **50% of the total rotation** of the cervical spine. ### **Why the Other Options are Incorrect** * **Atlanto-occipital joint (A):** This is a condylar synovial joint between the occipital condyles and the atlas. Its primary movement is flexion and extension (the "Yes" movement/nodding), with very limited lateral flexion. * **C2-C3 and C3-C4 joints (C & D):** These are typical cervical intervertebral joints consisting of an intervertebral disc and zygapophyseal (facet) joints. While they contribute to the remaining 50% of neck rotation and lateral bending, they are not the primary joints for the initial "looking right or left" movement. ### **High-Yield Clinical Pearls for NEET-PG** * **The "No" Joint:** Atlanto-axial joint (Rotation). * **The "Yes" Joint:** Atlanto-occipital joint (Flexion/Extension). * **Cruciate Ligament:** The transverse ligament of the atlas is the most important component of the cruciate ligament; it holds the dens against the atlas. Rupture (e.g., in Rheumatoid Arthritis or trauma) leads to atlanto-axial subluxation, which can be fatal due to spinal cord compression. * **Alar Ligaments:** These "check ligaments" limit the rotation of the head.

Q: The Grynfeltt triangle is not bounded by which of the following?

External oblique muscle. The **Grynfeltt-Lesshaft triangle** (Superior Lumbar Triangle) is a key anatomical landmark in the posterior abdominal wall, representing a potential site for lumbar hernias [1]. ### **Explanation of the Correct Answer** The **External oblique muscle (Option D)** is the correct answer because it does **not** form a boundary of the Grynfeltt triangle. Instead, the External oblique muscle forms the anterior (lateral) boundary of the **Petit’s triangle** (Inferior Lumbar Triangle). The Grynfeltt triangle is situated deeper and superior to Petit’s triangle. ### **Analysis of Other Options** The Grynfeltt triangle is bounded by: * **Superiorly:** The **12th rib** (Option A) and the serratus posterior inferior muscle. * **Medially:** The **Paraspinal muscles** (Option B), specifically the Erector spinae (Sacrospinalis). * **Laterally (Anteriorly):** The posterior border of the **Internal oblique muscle** (Option C). * **Floor:** Transversalis fascia and the aponeurosis of the transversus abdominis. * **Roof:** Latissimus dorsi muscle. ### **High-Yield Clinical Pearls for NEET-PG** * **Grynfeltt vs. Petit:** Grynfeltt (Superior) is larger and more common for hernias than Petit (Inferior) [1]. * **Petit’s Triangle Boundaries:** Base = Iliac crest; Posterior = Latissimus dorsi; Anterior = External oblique. * **Lumbar Hernia:** A protrusion of intraperitoneal or extraperitoneal contents through these triangles [1]. They are often acquired (post-traumatic or post-surgical) but can be congenital. * **Mnemonic:** Remember **"S-I-L-E"** for Grynfeltt: **S**erratus posterior inferior/12th rib, **I**nternal oblique, **L**atissimus dorsi (roof), **E**rector spinae.

Q: What is true about the spinal cord?

All of the above.. The spinal cord's termination level is a high-yield concept in anatomy, primarily governed by the differential growth rates between the vertebral column and the spinal cord (ascensus spinalis). **Explanation of Options:** * **Option A:** In adults, the spinal cord (conus medullaris) typically terminates at the **lower border of the L1 vertebra** or the L1-L2 intervertebral disc. This is the standard anatomical landmark used for clinical procedures. * **Option B:** In newborns, the spinal cord ends lower, typically at the **L3 vertebra**. As the child grows, the vertebral column lengthens faster than the spinal cord, causing the cord to "occupy" a higher relative position over time. * **Option C:** The **cauda equina** (horse's tail) is a bundle of spinal nerves (L2-Co1) that continues inferiorly from the conus medullaris. It occupies the subarachnoid space (the lumbar cisterna) and extends through the lumbar and sacral regions toward the coccyx to exit via their respective foramina. Since all statements are anatomically accurate, **Option D** is the correct answer. **Clinical Pearls for NEET-PG:** 1. **Lumbar Puncture (LP):** To avoid spinal cord injury, an LP is typically performed at the **L3-L4 or L4-L5** interspace in adults. In infants, it must be performed lower (below L3). 2. **Tethered Cord Syndrome:** A clinical condition where the conus medullaris is abnormally low (below L2 in adults), often associated with a thickened filum terminale. 3. **Filum Terminale:** An extension of the pia mater that anchors the spinal cord to the coccyx. 4. **Dural Sac:** While the cord ends at L1, the subarachnoid space (dural sac) ends at the **S2 level** in adults.

Question 1

Which of the following structures forms the renal angle?

Accepted Answer

Lower border of 12th rib and lateral border of erector spinae

Answer

Lower border of 11th rib and medial border of erector spinae

Answer

Lower border of 12th rib and medial border of erector spinae

Answer

Lower border of 11th rib and lateral border of erector spinae

Question 2

The Artery of Adamkiewicz is related to which of the following structures?

Accepted Answer

Spinal Cord

Answer

Hand

Answer

Penis

Answer

Brain

Question 3

Which of the following is NOT true about the iliolumbar ligament?

Accepted Answer

Its lower part is attached to the sacrospinous ligament.

Answer

It is attached to the transverse process of L4.

Answer

It is attached to the iliac crest.

Answer

It is superiorly continuous with the thoracolumbar fascia.

Question 4

A 39-year-old male presents with severe neck pain after a whiplash injury, sustained when his car was struck from behind. Radiographic studies reveal trauma to the ligament lying on the anterior surface of the cervical vertebral bodies. Which ligament is this?

Accepted Answer

Anterior longitudinal ligament

Answer

Ligamentum flavum

Answer

Nuchal ligament

Answer

Posterior longitudinal ligament

Question 5

Which of the following is FALSE about Luschka joints?

Accepted Answer

Cervical nerve roots pass posteromedial to these joints.

Answer

These are joints in the lateral part of adjacent bodies of cervical vertebrae.

Answer

Osteophytes commonly occur in these joints.

Answer

A common complication is vertebral basilar insufficiency.

Question 6

Which joint movement permits a person to look towards the right or left?

Accepted Answer

Atlanto-axial joint

Answer

Atlanto-occipital joint

Answer

C2-C3 joint

Answer

C3-C4 joint

Question 7

The Grynfeltt triangle is not bounded by which of the following?

Accepted Answer

External oblique muscle

Answer

12th rib

Answer

Paraspinal muscles

Answer

Internal oblique muscle

Question 8

What is true about the spinal cord?

Accepted Answer

All of the above.

Answer

In adults, the spinal cord ends at the lower border of the L1 vertebra.

Answer

In newborns, the spinal cord may extend up to L3.

Answer

The cauda equina extends from the lumbar vertebrae to the coccyx.

Question 9

A 44-year-old woman presents with headache and backache. Examination reveals fluid accumulation in the spinal epidural space due to damage to blood vessels or meninges. Which of the following structures is most likely ruptured?

Accepted Answer

Internal vertebral venous plexus

Answer

Vertebral artery

Answer

Vertebral vein

Answer

External vertebral venous plexus

Question 10

A young woman presents with neurological deficits following an explosion. She has no movement in her right lower extremity with hyperreflexia, loss of proprioception and fine touch in this extremity, but pain and temperature sensation are intact. Pain and temperature sensation are absent in the left lower limb. Movement and reflexes are normal in the left lower extremity and upper extremities. A lesion in which of the following locations can explain her neurological examination?

Accepted Answer

Hemisection of the right side of the spinal cord at the level of the first lumbar segment

Answer

Hemisection of the left side of the spinal cord at the level of the first lumbar segment

Answer

Hemisection of the left side of the spinal cord at the level of the fourth sacral segment

Answer

Hemisection of the right side of the spinal cord at the level of the fourth sacral segment

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