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?

Scaphoid and trapezium bones (D) Signup and view all the answers

Which tendons bound the anatomical snuff box laterally?

APL and EPB (A) Signup and view all the answers

What causes the visible concavity of the anatomical snuff box?

Full extension of the thumb (B) Signup and view all the answers

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

Flexor retinaculum division (A) Signup and view all the answers

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

Ulnar nerve (B) Signup and view all the answers

What is the typical sensory distribution of the ulnar nerve?

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

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

C8-T1 (A) Signup and view all the answers

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

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

What is the relationship between dermatomes and myotomes?

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

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

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

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

Fracture of the radial groove of the humerus (D) Signup and view all the answers

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

Pronator teres (B) Signup and view all the answers

What is the main cause of carpal tunnel syndrome?

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

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

Typing or other repetitive hand movements (A) Signup and view all the answers

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

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

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

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

What movements would be affected by the condition described?

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

What sensory deficits might be present in the condition described?

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

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

Wrist drop deformity and deltoid atrophy (C) Signup and view all the answers

Which anatomical reference is mentioned in the text?

Moore's Clinically Oriented Anatomy (A) Signup and view all the answers

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

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

Which nerve injury is described in the clinical correlation?

Radial nerve injury (B) Signup and view all the answers

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

Forceful and repeated flexion of the wrist and fingers (D) Signup and view all the answers

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

Anatomical snuff box (C) Signup and view all the answers

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

Tenderness and pain at the affected epicondyle (C) Signup and view all the answers

Which muscle group is primarily affected in medial epicondylitis?

Flexor muscles of the forearm (D) Signup and view all the answers

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

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

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

Regulating voluntary movements through the basal ganglia (D) Signup and view all the answers

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

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

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

Ventricles (C) Signup and view all the answers

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

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

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

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

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

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

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

Controlling voluntary movement and motor coordination (A) Signup and view all the answers

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

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

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

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

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

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

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

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

What is the primary function of the pontine nuclei?

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

Which cranial nerves emerge from the ponto-medullary sulcus?

Cranial nerves VI, VII, and VIII (B) Signup and view all the answers

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

Around the cerebral aqueduct in the midbrain (D) Signup and view all the answers

Which of the following statements about the midbrain is correct?

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) Signup and view all the answers

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

Vestibular nuclei (C) Signup and view all the answers

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

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

Flashcards

APL innervation

Deep branch of radial nerve

EPB Origin

Distal 1/3 of posterior surface of radius and interosseous membrane