Human Anatomy Vol 1

Muscles of thenar eminence

Abductor pollicis brevis -l

(Fig. 9.20)

ltst tayer

Flexor pollicis brevis _]

Opponens pollicis Srd layer

Adductor of thumb

Adductor pollicis 3rd layer

Muscle of medial side of palm

Palmaris brevis

Muscles of hypothenar eminence

Abductor digiti minimi I

Ftexor digiti minimi ) tst taver

Opponens digiti minimi 3rd layer

Lumbricals (Fig.9.21)

Lumbricals (4) 2nd layer

Arise from 4 tendons of flexor

digitorum profundus 2nd layer

Palmar interossei

Palmar (4)

(Fis. e.24b)

4th layer

Dorsal interossei

Dorsal (4)

(Fig. 9.24a)

4th layer

Tubercle of scaphoid, trapezium, flexor

retinaculum

Flexor retinaculum, trapezoid and capitate

bones

Flexor retinaculum

Oblique head: Bases of 2nd-3rd metacarpals;

transverse head: Shaft of 3rd metacarpal

Flexor retinaculum

Pisiform bone

Flexor retinaculum

Flexor retinaculum

'l st Lateral side of tendon of flexor

dlgitorum profundus of 2nd digit

2nd Lateral side of same tendon of 3rd digit

3rd Adjacent sides of same tendons of 3rd and

4th digits

4th Adjacent sides of same tendons of 4th and

Sth digits

1st Medial side of base of 1st metacarpal

Medial side of 2nd metacarpal -1

Lateral side of 4th metacarpal I

Lateral side of 5th metacarpal I

l

Adjacent sides of 1st and 2nd metacarpals

Adjacent sides of 2nd and 3rd metacarpals

Adjacent sides of 3rd and 4th metacarpals

Adjacent sides of 4th and Sth metacarpals

FOREARM AND HAND

Base of proximal phalanx of thumb

Base of proximal phalanx of thumb

Lateral half of palmar surface of the

shaft of metacarpal bone of thumb

Base of proximal phalanx of thumb

on its medial aspect

Skin of palm on medial side

Base of proximal phalanx of little finger

Base of proximal phalanx of little finger

Medial border of fifth metacarpal bone

Via extensor expansion into dorsum

of bases of distal phalanges

Medial side of base of proximal

phalanx of thumb or 1st digit

Via extensor expansion into dorsum

of bases of distal phalanges of 2nd,

4th and 5th digits

Via extensor expansion into dorsum

of bases of distal phalanges ol 2nd,

3rd, 3rd and 4th digits

Table 9.5: Attachments of small muscles of the hand

Origin lnseftion

2nd

3rd

4th

1st

2nd

3rd

4th

Feolules

Arteries of the hand are the terminal parts of the ulnar
and radial arteries. Branches of these arteries unite and
form anastomotic channels called the superficial and
deep palmar arches.

ULNAR ARTERY

The course of this artery in the forearm has been
described earlier. It enters the palm by passing
superficial to the flexor retinaculum but deep to volar
carpal ligament (Fig. 9.15). It ends by dividing into the
superficial palmar branch, which is the main
continuation of the artery, and the deep palmar branch.

These branches take part in the formation of the

superficial and deep palmar arches respectively.

Superficiol Polmor Arch

The arch represents an important anastomosis between

the ulnar and radial arteries.

The convexity of the arch is directed towards the

fingers, and its most distal point is situated at the level

of the distal border of the fully extended thumb.

Fo stion

The superficial palmar arch is formed as the direct

continuation of the ulnar artery beyond the flexor

retinaculum, i.e.by the superficial palmar branch. On

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