Y

Innervation

Ulnar nerve (C8-T1)

Trigger Point Location

Referred Pain

Ulnar side of the little finger Associated Internal Organs

In the muscle belly near the base of the metacarpal None bone V

■ Interosseous Muscles (Fig. 19.69)

Dorsal Interosseous Muscles Origin

Inside of all metacarpal bones

Insertion

• Base of the corresponding proximal phalanges

• Dorsal aponeurosis of fingers 2-4

Action

• Abduction of fingers 2-4

• Flexion of the proximal joints of the fingers with extension of the intermediate and distal joints

Innervation

Ulnar nerve (Tl)

Palmar ligaments

Abductor Pollicis Longus Tendon

Abductor pollicis longus tendon

Extensor pollicis brevis

Flexor carpi radialis tendon

Radius

Flexor digiti minimi

Abductor digiti minimi

Flexor carpi ulnaris tendon

Carpal tunnel

Palmar ligaments

Adductor pollicis, transverse head

Adductor pollicis. oblique head

Flexor pollicis brevis, superficial head

Abductor pollicis brevis

Flexor pollicis brevis, deep head

Flexor pollicis brevis, superficial head

Opponens pollicis

Abductor pollicis brevis

Flexor retinaculum (transverse carpal ligament)

Abductor pollicis longus tendon

Extensor pollicis brevis

Flexor carpi radialis tendon

Radius

Lumbricals

First through fourth dorsal interossei

Abductor digiti minimi

Flexor digiti minimi

Opponens digiti minimi

First through third palmar interossei

Opponens digiti minimi

Flexor digiti minimi

Abductor digiti minimi

Flexor carpi ulnaris tendon

Carpal tunnel

Fig. 19.69 From: Thieme Atlas of Anatomy. Vol. I: Genera/ Anatomy and Musculoskeletal System. Thieme Publishers, Stuttgart 2006.

Palmar Interosseous Muscles Origin

Metacarpal bones II, IV, and V Insertion

Base of the corresponding proximal phalanges

• Radiating into the tendons of the dorsal aponeurosis of fingers 2, 4, and 5

• Ulnar sesamoid bone of the thumb

Action

• Flexion of the proximal joints of the fingers with extension of the intermediate and distal joints

Innervation

Ulnar nerve (T1)

Trigger Point Location

Between the metacarpal bones (see Fig. 19.68)

Referred Pain

• Index finger (with a maximum on the radial side) and back of the hand (trigger point of the dorsal interosseous muscles of the index finger, a very common trigger point)

• Radial side of the fingers

Associated Internal Organs

None

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