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Questions and Answers
Which muscle does NOT receive innervation from the radial nerve?
Which muscle does NOT receive innervation from the radial nerve?
What is the primary role of the superficial branch of the radial nerve?
What is the primary role of the superficial branch of the radial nerve?
Which muscle is NOT innervated by the axillary nerve?
Which muscle is NOT innervated by the axillary nerve?
Which condition is primarily associated with injuries to the radial nerve?
Which condition is primarily associated with injuries to the radial nerve?
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What movement is primarily facilitated by the actions of the interossei muscles?
What movement is primarily facilitated by the actions of the interossei muscles?
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Where does the radial nerve typically emerge in the forearm?
Where does the radial nerve typically emerge in the forearm?
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Which anatomical structure is primarily associated with the anterior interosseous nerve?
Which anatomical structure is primarily associated with the anterior interosseous nerve?
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Which of the following arteries is most likely to be compromised if there is an injury to the axillary nerve?
Which of the following arteries is most likely to be compromised if there is an injury to the axillary nerve?
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Which of the following nerves supplies the skin of the dorsal surface of the lateral 3½ fingers?
Which of the following nerves supplies the skin of the dorsal surface of the lateral 3½ fingers?
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Which of the following statements about the ulnar nerve is correct?
Which of the following statements about the ulnar nerve is correct?
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Which nerve supplies the first two lumbricals of the hand?
Which nerve supplies the first two lumbricals of the hand?
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The lower lateral cutaneous nerve of the arm is responsible for supplying sensation to which area?
The lower lateral cutaneous nerve of the arm is responsible for supplying sensation to which area?
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What is the anatomical course of the radial nerve in the arm?
What is the anatomical course of the radial nerve in the arm?
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If a patient exhibits a winging scapula, which nerve is most likely affected?
If a patient exhibits a winging scapula, which nerve is most likely affected?
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Damage to which nerve could result in claw hand deformation?
Damage to which nerve could result in claw hand deformation?
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What is the primary action associated with the palmaris brevis muscle?
What is the primary action associated with the palmaris brevis muscle?
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The median nerve primarily innervates which hand muscles?
The median nerve primarily innervates which hand muscles?
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What function does the posterior cutaneous nerve of the forearm serve?
What function does the posterior cutaneous nerve of the forearm serve?
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Which anatomical structure does the musculocutaneous nerve penetrate?
Which anatomical structure does the musculocutaneous nerve penetrate?
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What is the primary function of the dorsal interossei muscles?
What is the primary function of the dorsal interossei muscles?
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What muscle does the axillary nerve primarily provide sensation to?
What muscle does the axillary nerve primarily provide sensation to?
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Where does the median nerve enter the palm of the hand?
Where does the median nerve enter the palm of the hand?
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Which of the following branches is NOT associated with the ulnar nerve?
Which of the following branches is NOT associated with the ulnar nerve?
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What is the pathway of the ulnar nerve in the forearm?
What is the pathway of the ulnar nerve in the forearm?
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Which condition is least likely to affect the palmar cutaneous branch of the median nerve?
Which condition is least likely to affect the palmar cutaneous branch of the median nerve?
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Which of the following statements about the radial nerve is correct?
Which of the following statements about the radial nerve is correct?
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What is a major consequence of injury to the median nerve at the elbow?
What is a major consequence of injury to the median nerve at the elbow?
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What structure does the median nerve NOT innervate in the hand?
What structure does the median nerve NOT innervate in the hand?
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Which of the following options lists a function of the ulnar nerve?
Which of the following options lists a function of the ulnar nerve?
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What function does the palmar cutaneous branch serve?
What function does the palmar cutaneous branch serve?
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Study Notes
Hand Anatomy Overview
- The hand is a complex structure, with many muscles and nerves.
- Key objectives for studying the hand include: identifying the thenar and hypothenar eminences, describing the movements, and understanding the nerve supply of the hand's muscles.
Muscles of the Hand
- Thenar eminence: Includes muscles of the thumb (abductor pollicis brevis, flexor pollicis brevis, opponens pollicis, and adductor pollicis).
- Hypothenar eminence: Includes muscles of the little finger (abductor digiti minimi, flexor digiti minimi, and opponens digiti minimi).
- Lumbricals: Four small muscles originating from the tendon of the flexor digitorum profundus; flex MCP joint and extend interphalangeal joints.
- Interossei: Dorsal and palmar; small muscles between metacarpal bones. Palmar interossei have an action of PAD, while Dorsal interrossei have an action of DAB.
Thenar Eminence Details
- Abductor pollicis brevis: Abducts the thumb.
- Flexor pollicis brevis: Flexes the thumb.
- Opponens pollicis: Opposes the thumb.
- Adductor pollicis: Adducts the thumb.
Hypothenar Eminence Details
- Abductor digiti minimi: Abducts the little finger.
- Flexor digiti minimi: Flexes the little finger.
- Opponens digiti minimi: Opposes the little finger.
Thumb Movements
- Abduction and adduction occur perpendicular to other fingers.
- Extension and flexion occur parallel to other fingers.
Palmaris Brevis
- A superficial muscle under the skin.
- Innervated by the ulnar nerve.
- Action: Helps grip, making the hypothenar eminence prominent.
Nerve Supply
- The ulnar nerve is responsible for the muscles of the hypothenar eminence, lumbricals, and interossei (of the palm), as well as the intrinsic muscles of the hand
- A lot of muscle innervation information was also provided for the other major nerves such as median, radial and axillary nerves in the slides
Nerve Injuries - Upper Limb
- Brachial Plexus injuries: Erb palsy (C5-C6 roots), Klumpke palsy (C8-T1 roots).
- Causes: Traction, or tear of upper (Erb) and lower (Klumpke) trunk of the nerves.
- Injuries can affect different muscles.
- Details, such as symptoms, presentation, and potential medical interventions, were provided.
Specific Nerves
- Musculocutaneous nerve: Originates from lateral cord (C5,6,7); supplies the coracobrachialis, biceps, and brachialis muscles; innervates skin of lateral forearm.
- Axillary nerve: From the posterior cord; innervates deltoid and teres minor muscles; supplies sensation to the deltoid musculature
- Median nerve: Originates laterally to the axillary artery, and in the forearm, it passes between the two heads of the pronator teres muscle. It also supplies a branch to the thenar muscles.
- Ulnar nerve: It arises medially to the axillary artery and in the forearm it passes between the two heads of the flexor carpi ulnaris muscle.
- Specific details, origins, courses, and the muscles innervated by each nerve were also included (radial nerve and its branches)
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Description
Explore the complex structure of the hand through this quiz. You'll learn about the muscles, movements, and nerve supply of the thenar and hypothenar eminences. Test your knowledge on the anatomy and functions of various muscles in the hand.
