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Extremities (2) > Muscles Of The Hand > Flashcards

Muscles Of The Hand Flashcards

1
Q

Thenar muscles (3)

A

Flexor Pollicis Brevis
Abductor Pollicis Brevis
Opponens Pollicis

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2
Q

OINA for Adductor Pollicis Brevis

A

OR: Scaphoid bone
Trapezium

INS: Base of proximal phalanx, digit 1 (lateral side)

NS: Recurrent branch of median nerve

AC: Abducts thumb at CMC and MCP

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3
Q

OINA for Flexor Pollicis Brevis

A

OR: Superficial head from flexor retinaculum and trapezium
Deep head- floor of the carpal tunnel (over trapezoid and capitate)

INS: Base of Proximal phalanx, digit 1 (lateral side)

NS: Recurrent branch of medial nerve (superficial head)
Deep branch of ulnar (deep head)

AC: Flexes digit 1 at MCP

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4
Q

OINA for Opponens Pollicis

A

OR: Trapezium

INS: Lateral side of 1st metacarpal

NS: Recurrent branch of median nerve

AC: Opposes digit 1
Pulls and medially rotates 1st metacarpal across the palm

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5
Q

Hypothenar muscles (3)

A

Flexor digiti minimi brevis

Abductor digiti minimi

Opponens digiti minimi

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6
Q

OINS for Abductor digiti minimi

A

OR: Pisiform

INS: Proximal phalanx of digit 5 (medial side)

NS: Deep branch of ulnar nerve

AC: Abduct digit 5

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7
Q

OINA for Frlexor Digigi Minimi Brevis

A

OR: Hook of hamate

INS: Proximal phalanx of digit 5

NS: Deep branch of ulnar nerve

AC: Flexes digit 5 at MCP

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8
Q

What muscle is not normally found in humans?

A

Flexor digiti minimi longus

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9
Q

OINA for Opponens Digiti Minimi

A

OR: Hook of hamate

INS: body of 5th metacarpal (palmar surface)

NS: Deep branch of ulnar nerve

AC: Opposes digit 5 (abducts, flexes and laterally rotates the 5th metacarpal, cupping the hand)

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10
Q

Central compartment muscles (8)

A

Abductor pollicis brevis

Flexor pollicis brevis

Oblique head of adductor pollicis

Transverse head of adductor pollicis

Flexor digiti minimi

Abductor digiti minimi

Superficial palmar arch

Common palmar digital branches

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11
Q

OINA Lumbricals 1 & 2

A

OR: Lateral 2 tendons of flexor digitorum profundus

INS: Attach to the lateral sides of the extensor expansion of digits 2 & 3

NS: Lateral 2 (digits 2 and 3)= median nerve

AC: Flexes MCP joints
Extends IP joints

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12
Q

OINA for Lumbricals 3 &E 4

A

OR: Medial 3 tendons of flexor digitorum profundus

INS: Lateral sides of the extensor expansion of digits 4 & 5

NS: Medial 2 (digits 4 & 5) = deep branch of ulnar nerve

Action: Flexes MCP joints
Extends the IP joints

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13
Q

OINA for Adductor Pollicis

A

OR: Oblique Head : Metacarpal 2 and 3, and capitate
Transverse head: metacarpal 3

INS: Sesamoid bone on medial side of MCP
Proximal phalanx of digit 1

NS: Deep branch of ulnar nerve

AC: Adduct digit 1

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14
Q

What muscle is innervated completely by the ulnar nerve?

A

Thenar muscle

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15
Q

OINA for Dorsal Interosseous

A

OR: Adjacent 2 metacarpals (all for are bipennate)

INS: Proximal Phalanx
Extensor expansion

NS: Deep branch of the ulnar nerve

AC: Abducts digits away from digit 3

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16
Q

Adductor compartment muscle

A

Adductor pollicis

17
Q

What muscles fill the space between the metacarpal bones?

A

Dorsal interosseous muscles

18
Q

Dorsal interosseous muscles are easily monitored indicators of:

A

Muscle wasting

19
Q

What digits last the dorsal interosseous muscles? Why?

A

1st and 5th digits because they have their own abductors

20
Q

Remember:
DAB =

PAD =

A

DAB = Dorsal interosseous ABducts

PAD = Palmar interosseous ADDucts

21
Q

OINA for Palmar interosseous muscles

A

OR: Arise from palmar surface of metacarpals 2, 4 and 5

INS: Extensor expansion at bases of proximal phalanges of digits 2, 4, & 5

NS: Deep branch of ulnar nerve

AC: Adducts digits towards digit 3

22
Q

Interosseous of the 1st metacarpal

A

Flexor Pollicis Brevis

23
Q

Extensor expansion, AKA

A

Dorsal expansion
Or
Dorsal hood

24
Q

Anatomical term that refers to the special connective attachments by which the extensor tendons insert into the phalanges

A

Extensor Expansion

25
Q

The aponeurosis of extensor muscles span:

A

The proximal and middle phalanges

26
Q

What happens to the extensor tendon at the distal end of the metacarpal?

A

It will expand to form a hood, which covers the back and sides of the head of the metacarpal and the proximal phalanx

27
Q

What muscles insert on the extensor expansion?

What do these serve to extend?

A

The Lumbricals, extensor indicis, dorsal interossei, and palmar interossei

These serve to extend the interphalangeal joints

28
Q

What muscles flex the metacarpal phalanges joints?

A

The interossei and Lumbricals

Extremities (2) (28 decks)

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