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Human Anatomy - Muscular System > Lecture 5 - Muscles Of The Hand > Flashcards

Lecture 5 - Muscles Of The Hand Flashcards

1
Q

What is the flexor rectinaculum ?

A
  • Also called the transverse carpal ligament
  • Runs between the outer carpals on the palmer side of the hand
  • Has a similar twin structure on the back of the hand
  • Also prevents the flexor tendons from bowstringing
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2
Q

What does the flexor rectinaculum create?

A
  • the carpal tunnel
  • which is a tunnel for the median nerve, flexor tendons, & blood vessels for the hand
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3
Q

What is carpal tunnel syndrome?

A
  • Compression of the median nerve due to overuse of the flexor tendons of the fingers (i.e., keyboard use)
  • Can also be caused by pregnancy & other medical conditions
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4
Q

What is the thenar muscle group?

A
  • Fleshy prominence on the radial side of the palm proximal to the thumb
  • Comprised of 4 muscles that act on the thumb only
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5
Q

What 4 muscles are part of the thenar group?

A
  • flexor pollicis brevis
  • abductor pollicis brevis
  • Opponens pollicis
  • adductor pollicis brevis
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6
Q

What is the origin/insertion/Innervation/main action of the flexor pollicis brevis?

A
  • part of the superficial layer
  • O: Flexor rectinaculum
  • I: Ulnar side of proximal phalanx of digit 1
  • Inn: Branch of median nerve
  • MA: Thumb flexion (at 1st CMC & MCP joint)
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7
Q

What is the origin/insertion/Innervation/main action of the abductor pollicis brevis?

A
  • part of the superficial layer
  • O: Flexor rectinaculum
  • I: Radial side of base of proximal phalanx
  • Inn: Branch of median nerve
  • MA: Thumb abduction
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8
Q

What is the origin/insertion/Innervation/main action of the Opponens pollicis ?

A
  • in the deep layer to the FPB & APB
  • O: Flexor rectinaculum
  • I: Radial side of the length of 1st metacarpal
  • Inn: Branch of median nerve
  • MA: Opposition of the thumb to other digits
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9
Q

What is the origin/insertion/Innervation/main action of the adductor pollicis brevis?

A
  • O: Oblique head: capitate & base of 2nd & 3rd metacarpals, Transverse head: palmer aponeurosis
  • I: Ulnar side of the proximal phalanx of the thumb
  • Inn: Branch of ulnar nerve
  • MA: Adducts the thumb
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10
Q

What is the hypothenar muscle group?

A
  • The fleshy prominence proximal to the 5th digit of the hand
  • Comprised of 3 muscles
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11
Q

What are the 3 muscles of the hypothenar group?

A
  • abductor digiti minimi
  • flexor digit minimi brevis
  • Opponens digiti minimi
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12
Q

What is the origin/insertion/Innervation/main action of the abductor digiti minimi?

A
  • part of the superficial layer
  • O: Pisiform
  • I: Base of the 5th proximal phalanx
  • Inn: Branch of ulnar nerve
  • MA: Abduction of the 5th digit (at 5th MCP joint)
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13
Q

What is the origin/insertion/Innervation/main action of the flexor digiti minimi brevis?

A
  • O: Hamate
  • I: Base of the 5th proximal phalanx
  • Inn: Branch of ulnar nerve
  • MA: Flexion of 5th digit (at 5th MCP joint)
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14
Q

What is the origin/insertion/Innervation/main action of the Opponens digiti minimi?

A
  • deep layer to the ADM & FDMB
  • O: Hamate
  • I: Ulnar border of 5th metacarpal
  • Inn: Branch of ulnar nerve
  • MA: Opposition of 5th digit to thumb
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15
Q

What are the short muscles of the hand?

A
  • lumbricals (4, worm like muscles in the palm)
  • dorsal interossei (4)
  • palmer interossei (3)
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16
Q

What is the origin/insertion/Innervation/main action of the lumbricals?

A
  • O: Tendons of flexor digitorum profundus
  • I: Expansions of extensor digitorum
  • Inn: Median nerve & ulnar nerve depending on location; 1 & 2 = 2 median, 3 & 4 = 4 ulnar
  • MA: Flexion at the metacarpophalangeal joint
17
Q

What is the origin/insertion/Innervation/main action of the dorsal interossei?

A
  • O: The 2 metacarpals between which it insterts; I.e., 1st dorsal interossei originates between the first & second metacarpals
  • I: Base of respective proximal phalanx
  • Inn: Branch of ulnar nerve
  • MA: Abduction of digits 2-4 & Assists the lumbricals in flexing the MCP joints & extending the IP joints
18
Q

What is the origin/insertion/Innervation/main action of the palmer interossei?

A
  • O: Palmer surfaces of metacarpals 2, 4, 5
  • I: Extensor expansion of the same digit
  • Inn: Branch of ulnar nerve
  • MA: Adduction of digits 2, 4, 5 & Assists lumbricals in flexing the MCP joints & extending the IP joints
19
Q

What is the extensor hood?

A
  • Also called the “Dorsal Digital Expansion” or “Extensor Expansion”
  • Made up of aponeurotic tendons of Extensor Digitorum and Extensor Pollicis Longus
  • Expands over the metacarpal heads and the proximal phalanges - dorsal

Human Anatomy - Muscular System (13 decks)

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