Ulnar Nerve Lecture 6: Motor and Sensory Supplies

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Match the following muscles with their primary function in the hand:

Abductor pollicis longus = Abducts the thumb Extensor pollicis brevis = Extends the thumb at the carpometacarpal joint Extensor pollicis longus = Extends the thumb at the interphalangeal joint Extensor indicis = Extends the index finger

Match the following nerves with their role in the posterior compartment of the forearm:

Radial nerve = Nerve supply to the extensor region Posterior interosseous nerve = Branch of the radial nerve supplying the extensor region

Match the following arteries with their blood supply in the forearm:

Posterior interosseous artery = Blood supply to the extensor region Radial artery = Principal blood supply to the forearm

Match the following anatomical components with their characteristics in relation to the hand:

Anatomical snuffbox = Location of superficial radial nerve Carpal tunnel = Contains median nerve and finger flexor tendons Signup and view all the answers

Match the following nerve branches with their functions:

Recurrent branch = Motor Supplies the thenar muscles Palmar digital branches = Mixed: Mainly sensory Supply skin on the palmar surface of the lateral three and one-half digits and the nail beds of those digits Palmar branch = Sensory Supplies skin on the middle palmar surfaces of hand, wrist, and distal forearm Signup and view all the answers

Match the contents of the anatomical snuffbox with their corresponding structures:

Radial artery = radial artery Extensor pollicis brevis tendon = extensor pollicis brevis tendon Extensor pollicis longus tendon = extensor pollicis longus tendon Abductor pollicis longus tendon = abductor pollicis longus tendon Signup and view all the answers

Match the forearm muscles with their innervating nerve:

Thenar muscles = Median nerve Extensor pollicis longus muscle = Radial nerve Extensor pollicis brevis muscle = Radial nerve Signup and view all the answers

Match the arterial supply structures with their corresponding arteries:

Superficial palmar arches = Ulnar artery Deep palmar arches = Radial artery Signup and view all the answers

Match the following muscles with their innervation by the ulnar nerve:

Hypothenar muscles = Deep branch Adductor pollicis muscle = Deep branch Palmaris brevis muscle = Palmar branch Interossei muscles = Deep branch Signup and view all the answers

Match the following areas with their sensory innervation by the ulnar nerve:

Skin on the palmar surface of the little finger and medial half of the ring finger = Palmar branch Skin on medial aspects of superior palm, wrist, and distal forearm = Palmar branch Skin on the dorsal surface of the medial aspect of the hand, including the dorsal surfaces of the little finger and the medial half of the ring finger = Dorsal branch Signup and view all the answers

Match the following concepts with their definitions:

Myotomes = The portion of skeletal muscle supplied by a single spinal cord level Dermatomes = The area of skin supplied by a single spinal cord level Peripheral nerve sensory innervation = The major peripheral nerves of the brachial plexus receive sensory information from these patches of skin Axillary nerve = Peripheral nerve sensory innervation Signup and view all the answers

Match the following terms with their descriptions:

Deep branch = Supplies Hypothenar muscles, Interossei muscles, Adductor pollicis muscle, and two medial lumbrical muscles Superficial branch = Supplies skin on the palmar surface of the little finger and medial half of the ring finger Palmar branch = Sensory innervation for skin on medial aspects of superior palm, wrist, and distal forearm Dorsal branch = Sensory innervation for skin on the dorsal surface of the medial aspect of the hand, including the dorsal surfaces of the little finger and the medial half of the ring finger Signup and view all the answers

Which of the following forearm muscles is NOT innervated by the ulnar nerve?

Flexor carpi ulnaris muscle Signup and view all the answers

Which area of skin does the palmar branch of the ulnar nerve supply?

Skin on the medial aspects of the superior palm, wrist, and distal forearm Signup and view all the answers

Which of the following movements can be used to test individual spinal cord levels according to myotomes?

Abduction of the shoulder Signup and view all the answers

Which spinal cord level is responsible for supplying the area of skin with minimal overlap of dermatomes on the dorsal surface of the medial aspect of the hand?

T1 Signup and view all the answers

Which nerve supplies the extensor region in the forearm?

Posterior interosseous branch of the radial nerve Signup and view all the answers

What is the primary function of the supinator muscle?

Forearm pronation Signup and view all the answers

Which artery provides blood supply to the extensor region in the forearm?

Posterior interosseous artery Signup and view all the answers

Which muscle is responsible for extending the thumb at the metacarpophalangeal joint?

Extensor pollicis longus Signup and view all the answers

What is the benefit of the anastomotic connection between the radial and ulnar arteries?

It allows for collateral circulation, providing alternative routes for blood flow in case of artery blockage. Signup and view all the answers

What are similar vascular connections found elsewhere in the body?

Circle of Willis in the brain Signup and view all the answers

What forearm muscles are innervated by the median nerve?

Pronator teres, flexor digitorum superficialis, flexor pollicis longus Signup and view all the answers

Which area does the palmar branch of the median nerve supply sensory innervation to?

Palmar surface of the thumb, index and middle fingers Signup and view all the answers

Which muscle in the deep layer of the forearm is responsible for extending the thumb at the metacarpophalangeal joint?

Extensor pollicis longus Signup and view all the answers

Which nerve supplies the extensor region in the forearm?

Posterior interosseous branch of the radial nerve Signup and view all the answers

Which nerve receives sensory information from the skin and the associated patches of skin in the upper limb?

Radial nerve Signup and view all the answers

Which spinal levels supply the myotomes of the upper limb?

Cervical and lumbar levels Signup and view all the answers

Which spinal cord level is primarily responsible for supplying the interossei muscles in the hand?

C7 Signup and view all the answers

What is the primary spinal cord level responsible for supplying the hypothenar muscles in the hand?

C8 Signup and view all the answers

Which spinal cord level is mainly responsible for supplying the adductor pollicis muscle in the hand?

C6 Signup and view all the answers

At which spinal cord level do the two medial lumbrical muscles receive their primary supply from?

C8 Signup and view all the answers

Why is the palmar interosseous muscle often rudimentary?

It has no agonist muscle to oppose its action. Signup and view all the answers

What is the primary reason for the absence of a palmar interosseous muscle associated with the middle digit?

The adjacent muscles can adequately perform the required movements for the middle digit. Signup and view all the answers

Why does the flexor digiti minimi brevis muscle not have a longus muscle agonist?

The function of this muscle is primarily for fine motor movements, not requiring a longus muscle agonist. Signup and view all the answers

What is the likely reason for the absence of a palmar interosseous muscle associated with the middle digit?

The adjoining muscles can effectively perform the required movements for the middle digit. Signup and view all the answers

Ulnar Nerve Lecture 6: Motor and Sensory Supplies

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Questions and Answers

Match the following muscles with their primary function in the hand:

Match the following nerves with their role in the posterior compartment of the forearm:

Match the following arteries with their blood supply in the forearm:

Match the following anatomical components with their characteristics in relation to the hand:

Match the following nerve branches with their functions:

Match the contents of the anatomical snuffbox with their corresponding structures:

Match the forearm muscles with their innervating nerve:

Match the arterial supply structures with their corresponding arteries:

Match the following muscles with their innervation by the ulnar nerve:

Match the following areas with their sensory innervation by the ulnar nerve:

Match the following concepts with their definitions:

Match the following terms with their descriptions:

Which of the following forearm muscles is NOT innervated by the ulnar nerve?

Which area of skin does the palmar branch of the ulnar nerve supply?

Which of the following movements can be used to test individual spinal cord levels according to myotomes?

Which spinal cord level is responsible for supplying the area of skin with minimal overlap of dermatomes on the dorsal surface of the medial aspect of the hand?

Which nerve supplies the extensor region in the forearm?

What is the primary function of the supinator muscle?

Which artery provides blood supply to the extensor region in the forearm?

Which muscle is responsible for extending the thumb at the metacarpophalangeal joint?

What is the benefit of the anastomotic connection between the radial and ulnar arteries?

What are similar vascular connections found elsewhere in the body?

What forearm muscles are innervated by the median nerve?

Which area does the palmar branch of the median nerve supply sensory innervation to?

Which muscle in the deep layer of the forearm is responsible for extending the thumb at the metacarpophalangeal joint?

Which nerve supplies the extensor region in the forearm?

Which nerve receives sensory information from the skin and the associated patches of skin in the upper limb?

Which spinal levels supply the myotomes of the upper limb?

Which spinal cord level is primarily responsible for supplying the interossei muscles in the hand?

What is the primary spinal cord level responsible for supplying the hypothenar muscles in the hand?

Which spinal cord level is mainly responsible for supplying the adductor pollicis muscle in the hand?

At which spinal cord level do the two medial lumbrical muscles receive their primary supply from?

Why is the palmar interosseous muscle often rudimentary?

What is the primary reason for the absence of a palmar interosseous muscle associated with the middle digit?

Why does the flexor digiti minimi brevis muscle not have a longus muscle agonist?

What is the likely reason for the absence of a palmar interosseous muscle associated with the middle digit?

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