Radial Nerve Branches and Muscles Origins and Insertions Quiz
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Questions and Answers

What nerve branch innervates the Abductor Pollicis Longus (APL) muscle?

  • Superficial branch of radial nerve
  • Deep branch of radial nerve (correct)
  • Median nerve
  • Ulnar nerve

What is the origin of the Extensor Pollicis Brevis (EPB) muscle?

  • Distal 1/3 of posterior surface of radius and interosseous membrane (correct)
  • Middle of posterior surface of radius, ulna, and interosseous membrane
  • Distal 1/3 of posterior surface of radius
  • Middle 1/3 of posterior surface of ulna

Which muscle inserts on the base of the distal phalanx of the thumb?

  • Extensor Pollicis Longus (EPL) (correct)
  • Abductor Pollicis Longus (APL)
  • Extensor Pollicis Brevis (EPB)
  • Extensor Indicis (EI)

What forms the floor of the anatomical snuff box?

<p>Scaphoid and trapezium bones (D)</p> Signup and view all the answers

Which tendons bound the anatomical snuff box laterally?

<p>APL and EPB (A)</p> Signup and view all the answers

What causes the visible concavity of the anatomical snuff box?

<p>Full extension of the thumb (B)</p> Signup and view all the answers

What is the name of the surgical procedure used to relieve symptoms of carpal tunnel syndrome?

<p>Flexor retinaculum division (A)</p> Signup and view all the answers

Which nerve is primarily affected in an ulnar nerve lesion, resulting in an 'ulnar claw hand' deformity?

<p>Ulnar nerve (B)</p> Signup and view all the answers

What is the typical sensory distribution of the ulnar nerve?

<p>Palmar and dorsal surface of the medial 1.5 digits (D)</p> Signup and view all the answers

Which spinal nerve roots contribute to the formation of the ulnar nerve?

<p>C8-T1 (A)</p> Signup and view all the answers

Which of the following is the primary function of the ventral/anterior root of a spinal nerve?

<p>Carry motor information out of the central nervous system (B)</p> Signup and view all the answers

What is the relationship between dermatomes and myotomes?

<p>Dermatomes describe the sensory distribution while myotomes describe the motor distribution of a spinal nerve root (B)</p> Signup and view all the answers

What is the main function of the deep branch of the radial nerve?

<p>Innervate the muscles in the posterior compartment of the forearm (A)</p> Signup and view all the answers

What is the mechanism of injury for radial nerve palsy (wrist drop)?

<p>Fracture of the radial groove of the humerus (D)</p> Signup and view all the answers

Which of the following muscles is innervated by the median nerve?

<p>Pronator teres (B)</p> Signup and view all the answers

What is the main cause of carpal tunnel syndrome?

<p>Compression of the median nerve as it passes through the carpal tunnel (D)</p> Signup and view all the answers

Which of the following activities can contribute to the development of carpal tunnel syndrome?

<p>Typing or other repetitive hand movements (A)</p> Signup and view all the answers

Which of the following is a symptom of carpal tunnel syndrome?

<p>Numbness and tingling in the first 3.5 digits of the hand (B)</p> Signup and view all the answers

Which muscles are affected by the condition described in the text?

<p>Deltoid, Teres Minor, Distal Triceps, Anconeus, forearm muscles (C)</p> Signup and view all the answers

What movements would be affected by the condition described?

<p>Abduction and external rotation of the shoulder, extension of the elbow, wrist, and fingers, supination (A)</p> Signup and view all the answers

What sensory deficits might be present in the condition described?

<p>Loss of sensation to the lateral aspect of the shoulder, posterior forearm, and lateral 3.5 digits (dorsal surface) (D)</p> Signup and view all the answers

What long-term deficit might occur due to the condition described?

<p>Wrist drop deformity and deltoid atrophy (C)</p> Signup and view all the answers

Which anatomical reference is mentioned in the text?

<p>Moore's Clinically Oriented Anatomy (A)</p> Signup and view all the answers

What is the main cause of lateral epicondylitis (tennis elbow) according to the text?

<p>Overuse or strain of the common extensor tendon (C)</p> Signup and view all the answers

Which nerve injury is described in the clinical correlation?

<p>Radial nerve injury (B)</p> Signup and view all the answers

What is the primary cause of medial epicondylitis (golfer's elbow)?

<p>Forceful and repeated flexion of the wrist and fingers (D)</p> Signup and view all the answers

What anatomical structure does the radial artery pass through according to the text?

<p>Anatomical snuff box (C)</p> Signup and view all the answers

What is a common symptom associated with both medial and lateral epicondylitis?

<p>Tenderness and pain at the affected epicondyle (C)</p> Signup and view all the answers

Which muscle group is primarily affected in medial epicondylitis?

<p>Flexor muscles of the forearm (D)</p> Signup and view all the answers

Which of the following is NOT a function of the midbrain?

<p>Transmits all ascending and descending tracts between the cerebrum and spinal cord (A)</p> Signup and view all the answers

What is the primary role of the substantia nigra in the midbrain?

<p>Regulating voluntary movements through the basal ganglia (D)</p> Signup and view all the answers

Which of the following is a function of the red nucleus in the midbrain?

<p>Being associated with the rubrospinal tract as part of the extrapyramidal pathways (A)</p> Signup and view all the answers

Which of the following is NOT a structure found in the transverse section of the midbrain?

<p>Ventricles (C)</p> Signup and view all the answers

What is the main function of the superior and inferior colliculi in the midbrain?

<p>Relay centers for visual and auditory reflexes, respectively (A)</p> Signup and view all the answers

What is the primary role of the cerebral peduncles in the midbrain?

<p>Contain descending tracts such as corticospinal and corticobulbar tracts (A)</p> Signup and view all the answers

What is the primary function of the diencephalon in the human brain?

<p>To regulate the autonomic nervous system and endocrine function (B)</p> Signup and view all the answers

Which of the following is NOT a primary function of the thalamus within the diencephalon?

<p>Controlling voluntary movement and motor coordination (A)</p> Signup and view all the answers

What is the primary role of the epithalamus within the diencephalon?

<p>Regulating the circadian rhythm and distribution of melanin pigment in the skin (D)</p> Signup and view all the answers

Which of the following is a key function of the hypothalamus within the diencephalon?

<p>Regulating the function of the major endocrine glands via the pituitary gland (A)</p> Signup and view all the answers

What is the relationship between the diencephalon and the cerebral hemispheres?

<p>The diencephalon is located between the cerebral hemispheres and the midbrain, serving as a processing and distribution center (C)</p> Signup and view all the answers

What is the primary function of the pineal gland, which is part of the epithalamus within the diencephalon?

<p>To regulate the body's circadian rhythm and the distribution of the pigment melanin in the skin (D)</p> Signup and view all the answers

What is the primary function of the pontine nuclei?

<p>To relay motor pathways between the cerebrum and cerebellum for coordination of voluntary movements (C)</p> Signup and view all the answers

Which cranial nerves emerge from the ponto-medullary sulcus?

<p>Cranial nerves VI, VII, and VIII (B)</p> Signup and view all the answers

What is the location of the Periaqueductal Gray Matter (PAG)?

<p>Around the cerebral aqueduct in the midbrain (D)</p> Signup and view all the answers

Which of the following statements about the midbrain is correct?

<p>The tectum is located behind the cerebral aqueduct, the tegmentum extends from the aqueduct to the substantia nigra, and the cerebral peduncle is inferior to the tegmentum. (D)</p> Signup and view all the answers

Which of the following nuclei are NOT mentioned as being present in the pons?

<p>Vestibular nuclei (C)</p> Signup and view all the answers

What is the relationship between the pons and the surrounding structures?

<p>The pons is related to the cerebellum posteriorly, the medulla oblongata inferiorly, and the midbrain superiorly. (C)</p> Signup and view all the answers

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