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Questions and Answers
Which muscles act at the distal interphalangeal joints (DIP)?
Which muscles act at the distal interphalangeal joints (DIP)?
What provides support to the joints of the digits?
What provides support to the joints of the digits?
Which joint is located proximal to the interphalangeal joints?
Which joint is located proximal to the interphalangeal joints?
Which of the following is true regarding the flexor digitorum superficialis muscle?
Which of the following is true regarding the flexor digitorum superficialis muscle?
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Which of the following joints would be responsible for finger extension?
Which of the following joints would be responsible for finger extension?
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What is the function of the flexor digitorum profundus muscle?
What is the function of the flexor digitorum profundus muscle?
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Which muscle is primarily responsible for flexing the proximal interphalangeal joints?
Which muscle is primarily responsible for flexing the proximal interphalangeal joints?
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Which of these options describes the relationship between the carpals and metacarpals?
Which of these options describes the relationship between the carpals and metacarpals?
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Which nerve innervates the medial two lumbrical muscles?
Which nerve innervates the medial two lumbrical muscles?
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What is the main function of the lumbrical muscles at the IP joints?
What is the main function of the lumbrical muscles at the IP joints?
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Where do the lumbrical muscles originate?
Where do the lumbrical muscles originate?
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Which digits do the lumbrical muscles insert into?
Which digits do the lumbrical muscles insert into?
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The innervation of the lateral two lumbrical muscles is predominantly by which nerve?
The innervation of the lateral two lumbrical muscles is predominantly by which nerve?
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What do the palmar interosseous muscles primarily act on?
What do the palmar interosseous muscles primarily act on?
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What is the primary action of the dorsal interosseous muscles?
What is the primary action of the dorsal interosseous muscles?
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Which interosseous muscles are innervated by the deep branch of the ulnar nerve?
Which interosseous muscles are innervated by the deep branch of the ulnar nerve?
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What is the origin of the flexor digiti minimi muscle?
What is the origin of the flexor digiti minimi muscle?
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Which nerve innervates the deep branch of the opponens digiti minimi muscle?
Which nerve innervates the deep branch of the opponens digiti minimi muscle?
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What are the terms used instead of anterior and posterior when referring to the hand?
What are the terms used instead of anterior and posterior when referring to the hand?
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What is the insertion site for the flexor digitorum superficialis muscle?
What is the insertion site for the flexor digitorum superficialis muscle?
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Which type of joint are the interphalangeal joints classified as?
Which type of joint are the interphalangeal joints classified as?
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In anatomical terms, what does the term 'midline' refer to in relation to the hand?
In anatomical terms, what does the term 'midline' refer to in relation to the hand?
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What muscle originates on the tendons of the flexor digitorum profundus muscle?
What muscle originates on the tendons of the flexor digitorum profundus muscle?
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How are the movements of the digits typically described?
How are the movements of the digits typically described?
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Which of the following is NOT a muscle that inserts at the proximal phalanx?
Which of the following is NOT a muscle that inserts at the proximal phalanx?
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What type of joint are metacarpophalangeal (MCP) joints classified as?
What type of joint are metacarpophalangeal (MCP) joints classified as?
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Where does the flexor digitorum profundus muscle originate?
Where does the flexor digitorum profundus muscle originate?
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What terminology is used to describe the palm region of the hand?
What terminology is used to describe the palm region of the hand?
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Which of the following structures does NOT provide innervation to the muscles in the central compartment?
Which of the following structures does NOT provide innervation to the muscles in the central compartment?
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What is the insertion point of the lumbrical muscles?
What is the insertion point of the lumbrical muscles?
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What is the correct description of proximal interphalangeal joints?
What is the correct description of proximal interphalangeal joints?
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What is typically included in the description of hand movements?
What is typically included in the description of hand movements?
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What is the innervation of the adductor pollicis muscle?
What is the innervation of the adductor pollicis muscle?
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Which muscle is primarily responsible for thumb abduction?
Which muscle is primarily responsible for thumb abduction?
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What is the main action of the flexor pollicis brevis muscle?
What is the main action of the flexor pollicis brevis muscle?
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From which origins do the thenar muscles derive their innervation, except for the adductor pollicis?
From which origins do the thenar muscles derive their innervation, except for the adductor pollicis?
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What is the origin of the flexor pollicis brevis muscle?
What is the origin of the flexor pollicis brevis muscle?
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Which muscle's deep head originates from the carpals?
Which muscle's deep head originates from the carpals?
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Which of the following statements about the thenar eminence is true?
Which of the following statements about the thenar eminence is true?
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What is the common location for the insertion of the thenar muscles?
What is the common location for the insertion of the thenar muscles?
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Which nerve is responsible for innervating the skin of the lateral antebrachial region?
Which nerve is responsible for innervating the skin of the lateral antebrachial region?
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Which of the following statements accurately describes the contribution of nerves to dermatomes?
Which of the following statements accurately describes the contribution of nerves to dermatomes?
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What is the primary factor upon which dermatomes are based?
What is the primary factor upon which dermatomes are based?
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Which nerve primarily serves the C8-T1 region?
Which nerve primarily serves the C8-T1 region?
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Which statement about the axillary nerve is correct?
Which statement about the axillary nerve is correct?
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What are the terms used to refer to the front and back when describing the hand?
What are the terms used to refer to the front and back when describing the hand?
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Which type of joint are the interphalangeal joints classified as?
Which type of joint are the interphalangeal joints classified as?
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How are movements of the digits typically described?
How are movements of the digits typically described?
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What type of joint are metacarpophalangeal (MCP) joints classified as?
What type of joint are metacarpophalangeal (MCP) joints classified as?
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When referring to the distal interphalangeal joints (DIP), which joints are located proximal to them?
When referring to the distal interphalangeal joints (DIP), which joints are located proximal to them?
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Which structure serves to describe the central area of the hand?
Which structure serves to describe the central area of the hand?
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Which of the following accurately describes the relationship of the joints in the hand?
Which of the following accurately describes the relationship of the joints in the hand?
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The term 'midline' in relation to the hand refers to what?
The term 'midline' in relation to the hand refers to what?
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What is the insertion point for the flexor digiti minimi muscle?
What is the insertion point for the flexor digiti minimi muscle?
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Which muscle originates from the tendons of the flexor digitorum profundus muscle?
Which muscle originates from the tendons of the flexor digitorum profundus muscle?
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Which nerve primarily innervates the opponens digiti minimi muscle?
Which nerve primarily innervates the opponens digiti minimi muscle?
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What is the origin of the flexor digitorum superficialis muscle?
What is the origin of the flexor digitorum superficialis muscle?
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How many lumbrical muscles originate from the flexor digitorum profundus tendons?
How many lumbrical muscles originate from the flexor digitorum profundus tendons?
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Where do the inserts of the lumbrical muscles occur?
Where do the inserts of the lumbrical muscles occur?
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Which structure does NOT originate from the carpals in the central compartment?
Which structure does NOT originate from the carpals in the central compartment?
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What is the main function of the deep branch of the ulnar nerve in relation to the hand muscles?
What is the main function of the deep branch of the ulnar nerve in relation to the hand muscles?
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What is the primary action of the lumbrical muscles at the proximal interphalangeal joints?
What is the primary action of the lumbrical muscles at the proximal interphalangeal joints?
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Which digits do the palmar interosseous muscles primarily act on?
Which digits do the palmar interosseous muscles primarily act on?
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What is the innervation of the lateral two lumbrical muscles?
What is the innervation of the lateral two lumbrical muscles?
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What is the origin of the interosseous muscles?
What is the origin of the interosseous muscles?
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Which nerve is responsible for innervating the deep branch of the ulnar nerve, which supplies certain muscles in the hand?
Which nerve is responsible for innervating the deep branch of the ulnar nerve, which supplies certain muscles in the hand?
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Which of the following describes the insertion of the dorsal interosseous muscles?
Which of the following describes the insertion of the dorsal interosseous muscles?
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What action do the dorsal interosseous muscles primarily facilitate?
What action do the dorsal interosseous muscles primarily facilitate?
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Which muscle group lies between the metacarpal bones of the hand?
Which muscle group lies between the metacarpal bones of the hand?
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Which nerve is responsible for innervating the majority of intrinsic muscles in the hand?
Which nerve is responsible for innervating the majority of intrinsic muscles in the hand?
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What is the primary action associated with an injury to the median nerve at the wrist?
What is the primary action associated with an injury to the median nerve at the wrist?
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The palmaris brevis muscle is innervated by which branch of the ulnar nerve?
The palmaris brevis muscle is innervated by which branch of the ulnar nerve?
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Which statement accurately describes the location of the carpal tunnel?
Which statement accurately describes the location of the carpal tunnel?
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What impact does an injury to the ulnar nerve at the wrist have on hand function?
What impact does an injury to the ulnar nerve at the wrist have on hand function?
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Which nerve is mainly associated with the recurrent branch that innervates the thenar muscles?
Which nerve is mainly associated with the recurrent branch that innervates the thenar muscles?
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Which of the following best describes the palmar aponeurosis?
Which of the following best describes the palmar aponeurosis?
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What condition is commonly referred to as 'funny bone' injury?
What condition is commonly referred to as 'funny bone' injury?
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Study Notes
Hand Anatomy: Joints
- The joints of the digits are supported by the digital collateral ligaments.
- Interphalangeal joints are hinge joints, allowing flexion and extension.
- Metacarpophalangeal joints are condyloid joints, allowing flexion, extension, abduction, and adduction.
Hand Anatomy: Muscles
- Opponens digiti minimi: Originates from the carpals and inserts on the 5th metacarpal. Many people may not have this muscle.
-
Lumbrical Muscles: Originate on the flexor digitorum profundus tendon.
- The medial two lumbrical muscles are innervated by the ulnar nerve
- The lateral two lumbrical muscles are innervated by the median nerve.
- Main function: Flexion of MCP joints and extension of IP joints.
-
Palmar interossei:
- Originate on the metacarpals and insert on digits 2, 4, and 5.
- Innervated by the deep branch of the ulnar nerve.
- Primary action is adduction of the fingers.
-
Dorsal interossei:
- Originate on the metacarpals and insert on digits 2, 3, and 4.
- Innervated by the deep branch of the ulnar nerve.
- Primary action is abduction of the fingers.
-
Adductor pollicis:
- Originates from the metacarpals and carpals and inserts on the proximal phalanx of the thumb.
- Unique innervation: Deep branch of the ulnar nerve unlike other thenar muscles.
- Primary action is adduction of the thumb.
Hand Anatomy: Muscles (Chart)
- Abductor pollicis brevis: Originates from the carpals and inserts on the proximal phalanx of the thumb. Main action is abduction of the thumb. Innervation: Median nerve.
- Flexor pollicis brevis: Originates from the carpals and inserts on the proximal phalanx of the thumb. Main action is flexion of the thumb. Innervation: Median nerve.
Hand Anatomy
- When describing the hand, use palmar and dorsal instead of anterior and posterior.
- The interphalangeal joints are hinge joints.
- Metacarpophalangeal joints are condyloid joints.
- The opponens digiti minimi muscle is small and some people don't have one.
- The lumbrical muscles originate on the tendons of the flexor digitorum profundus muscle.
- The interosseus muscles lie between the metacarpal bones of the hand.
- The ulnar nerve innervates the majority of the intrinsic muscles in the hand.
- The median nerve is responsible for many functions in the hand.
Lumbrical Muscle Innervation
- The medial two lumbrical muscles are innervated by the ulnar nerve.
- The lateral two lumbrical muscles are innervated by the median nerve.
Nerve Maps
- Nerve maps are different from dermatomes.
- Nerves may carry fibers from multiple spinal levels and contribute to different dermatomes.
Dermatomes
- Based on embryological development of spinal segments.
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Description
Explore the intricate details of hand anatomy focusing on the joints and muscles. This quiz covers essential aspects such as the types of joints involved and the specific muscles that facilitate hand movements. Test your knowledge on how these components interact to support hand function.
