Hand

Question 1

Palmaris brevis attachments and actions

Answer 1

Attachments:
flexor retinaculum and medial border of palmar aponeurosis
dermis of medial border of hand

Actions:
deepens groove along medial aspect of hypothenar eminence, wrinkles skin, slightly accentuates eminence
may contribute to grip

Question 2

Flexor Pollicis Brevis attachments and actions

Answer 2

Attachments:
Flexor retinaculum, tubercles of trapezium and trapezoid
Lateral aspect of base of 1st proximal phalanx

Actions:
Flexion of thumb

Question 3

Opponens Pollicis attachments and actions

Answer 3

Attachments:
Flexor retinaculum, tubercles of trapezium and scaphoid
Lateral surface of 1st metacarpal

Actions:
Opposes (draws medially and medially rotates) 1st metacarpal

Question 4

Adductor Pollicis attachments and actions

Answer 4

Attachments:
Oblique head: capitate, bases of metacarpals 2 and 3
Transverse head: anterior shaft 3rd metacarpal
Medial aspect of base of 1st proximal phalanx

Actions:
Adducts 1st digit

Question 4

Abductor Pollicis Brevis attachments and actions

Answer 4

Attachments:
Flexor retinaculum, tubercles of trapezium and scaphoid
Lateral aspect of base of 1st proximal phalanx

Actions:
Abducts 1st digit
Assists in opposition by rotating 1st digit medially

Question 5

Opponens Digiti Minimi attachments and actions

Answer 5

Attachments:
Hook of hamate and flexor retinaculum
Medial border of 5th metacarpal

Actions:
Opposes (flexes and laterally rotates) 5th metacarpal

Question 5

Lumbricals attachments and actions

Answer 5

Attachments:
Tendons of flexor digitorum profundus
Lateral aspect of extensor expansion of digits 2-5

Actions:
Flexion of metacarpophalangeal joints of digits 2-5
Extension of interphalangeal joints of digits 2-5

Question 5

Flexor Digiti Minimi Brevis attachments and actions

Answer 5

Attachments:
Hook of hamate and flexor retinaculum
Medial aspect of base of 5th proximal phalanx

Actions:
Flexion of 5th proximal phalanx

Question 5

Dorsal Interosseus Muscles attachments and actions

Answer 5

Attachments:
Adjacent sides of 2 metacarpals (bipennate) 1:1+2, 2:2+3, 3:3+4, 4:4+5
Base of proximal phalanges 2-4, extensor expansion of digits 2-4

Actions:
Abduct digits 2, 3and 4
Assist in flexion at metacarpophalangeal joints and extension at interphalangeal joints

Question 6

Abductor Digiti Minimi attachments and actions

Answer 6

Attachments:
Pisiform
Medial aspect of base of 5th proximal phalanx

Actions:
Abducts 5th digit

Question 7

Palmar Interosseus Muscles attachments and actions

Answer 7

Attachments:
1 = medial aspect 2nd metacarpal, 2 = lateral aspect 4th metacarpal, 3 = lateral aspect 5th metacarpal

Base of proximal phalanx and extensor expansion of digit 2, 4 or 5 (same aspect as proximal attachment)

Actions:
Adduct digits 2, 4 and 5 respectively
Assist in flexion of metacarpophalangeal joints and extension of interphalangeal joints