Flashcards in The forearm, wrist, and hand 2 Deck (49):
The innervation of the hand is provided by the
Median and ulnar nerves
The primary motor nerve to the intrinsic hand muscles
The primary sensory nerve to the palmar hand
The eight carpal bones are arranged in two rows of four. In the proximal row, the scaphoid and lunate bones articulate with the
Lies within the tendon of the flexor carpi ulnaris muscle
The eight carpal bones are arranged in two rows of four. In the distal row, the trapezium articulates with the
In the distal row, the ulnar nerve and artery pass lateral to the
Hook of the hamate bone
The hand bones include 5 metacarpel bones and
14 phalanges (finger bones)
The only finger with 2 phalanges instead of three
What are three joints of the hand?
1.) Thumb carpometacarpel
2.) Metacarpophalangeal (MCP)
The metacarpal bones articulate with the proximal phalanges of the digits forming the
"Knuckles" of the hand
The articulation of the proximal and middle phalanges
Proximal interphalangeal joint (PIP)
The articulation between the middle and distal phalanges
Distal interphalangeal joint (DIP)
What are the movements seen at the thumb carpometacarpel joint?
Flexion/extension, abduction/adduction, and opposition/reposition
What are the movements seen at the metacarpophalangeal (MCP) joints?
Flexion/extension, abduction/adduction, and circumduction
What are the movements seen at the interphalangeal joints?
The fascia of the wrist and hand greatly facilitates
Protects the palmar surface and adheres to the skin improving grip
Prevents "bowstringing" of flexor tendons and forms the roof of the carpal tunnel
The passageway for nine flexor tendons and the median nerve into the hand
The carpal tunnel
Provide fine movement of the digits and occupy primarily the palmar aspect of the hand
Intrinsic hand muscles
The intrinisic hand muscles can be compartmentalized into
1.) Thenr muscles
2.) Hypothenar muscles
3.) Lumbricales and interossei muscles
Muscles that move the thumb
Muscles that move the small finger
Muscles that move the digits
Lumbricales and interossei muscles
What are the three muscles of the thenar eminence and what are their functions?
1.) Pollicis brevis: Thumb flexion
2.) Abductor pollicis brevis: Thumb ABduction
3.) Opponens ollicis: Thumb opposition
The muscles of the thenar eminence are innervated by the
Recurrent median nerve
What are the three muscles of the hypothenar eminence and what are their functions?
1.) Flexor digiti minimi: Small finger extension
2.) Abductor digiti minimi: Small finger ABduction
3.) Opponens digiti minimi: Small finger opposition
The muscles of the hypothenar eminence are innervated by the
Deep ulnar nerve
What are the 4 intrinsic muscles?
1.) Adductor pollicis
3.) Dorsal interossei
4.) Palmar interossei
The adductor pollicis muscle function in
The Lumbrical muscle functions in
Flexion at MP and extension at IP
The dorsal interossei muscle functions in
ABduction of digits 2-4
The palmar interossei functions in
ADduction of digits 2, 3, and 5
The intrinsic (lumbricale and interossei) muscles are innervated by the
Deep ulnar nerve for most
2 Radial lumbricals innervated by median nerve
Supplies sensory innervation to the palmar surface of the skin covering the radial three and one-half digits and supplies motor innervation to 5 intrinsic hand muscles
Which hand muscles does the median nerve supply?
2 radial Lumbricals
Abductor Pollicis brevis
Flexor pollicis brevis
Supplies sensory innervation to the palmar surface of the skin covering the ulnar one and one-half digits and supplies motor innervation to the remaining 13
intrinsic hand muscles
The radial and ulnar arteries anastomose forming palmar arterial arches. The superficial palmar arch is primarily
The radial and ulnar arteries anastomose forming palmar arterial arches. The deep palmar arch is primarily
Fracture that most commonly results from a fall on an outstretched extended hand
Dorsal view shows a radial deviation of hand with ulnar prominance of styloid process
Usually caused by fall on outsretched hand with impact on thenar eminance
When dealing with forearm muscles, if a muscle crosses more than one joint, its primary action is at the
Distal-most joint it crosses
Carpel tunnel syndrome is the result of
Inflammation in the carpel tunnel that causes median nerve compression
Which spinal nerves are responisble for the motor function of the hand?
C8 and T1
Which spinal nerves are responsible for the sensory function of the hand?
C6, C7, C8
Which digits receive sensory innervation from the Ulnar nerve?
Ulnar 1.5 digits