intrinsic muscles of Hand.pptx

Intrinsic muscles of the hand
thenar
hypo thenar
lumbricals
palmar and dorsal interossei
median nerve
ulnar nerve

1. Hand (INTRINSIC MUSCLES OF HAND) Dr. Amaan

2. INTRINSIC MUSCLES OF HAND Features Serve the function of: Adjusting the hand during gripping and Carrying out fine skilled movements. The origin and insertion of these muscles is within the territory of the hand.

3. INTRINSIC MUSCLES OF HAND Situated totally within the hand: Divided into 4 groups:- Thenar Hypothenar Lumbricals Interossei muscles There are 20 muscles in the hand

4. The planes of movements of the fingers

5. 1. a. Three muscles of thenar eminence i . Abductor pollicis brevis ii. Flexor pollicis brevis iii. Opponens pollicis b. One adductor of thumb: Adductor pollicis

6. Thenar Muscles Abductor pollicis brevis Flexor pollicis brevis Opponens pollicis Adductor pollicis

7. 1. ABDUCTOR POLLICIS BREVIS Origin : flexor retinaculam , Scaphoid & Trapezium Insertion : Lateral side of base of proximal phalanx of thumb Action : Abducts thumb Innervation median nerve

8. 2. FLEXOR POLLICIS BREVIS Origin : flexor retinaculam , Trapezium , capitate Insertion : Lateral side of base of proximal phalanx of thumb Action : Flexes thumb Innervation median nerve

9. 3. OPPONENS POLLICIS Origin : flexor retinaculam , Trapezium Insertion : Lateral side of 1st metacarpal Action : pulls thumb medially &forward across the palm (opposes thumb towards the fingers) Innervation median nerve

10. 4. ADDUCTOR POLLICIS Origin : oblique head:- 2 nd ,3 rd metacarpals transverse head : 3 rd metacarpal Insertion : media l side of base of proximal phalanx of thumb Action : A dd ucts thumb Innervation ulnar nerve

11. 2 . Four hypothenar muscles i . Palmaris brevis . ii. Abductor digiti minimi . iii. Flexor digiti minimi . iv. Opponens digiti minimi . Muscles (ii) to (iv) are muscles of hypothenar eminence.

12. 2. Hypothenar Muscles

13. 1. PALMAR BREVIS Origin : flexor retinaculam , Insertion : Skin on the medial side of the palm Action : Wrinkles the skin on the medial side of the palm Innervation superficial branch of ulnar nerve

14. 2. ABDUCTOR DIGITI MINIMI The most superficial of the hypothenar muscles forming the hypothenar eminence Origin : P i s i f orm b o ne Insertion : proximal phalanx of 5th digit (little finger) Action : abducts little finger Innervation deep branch of ulnar nerve

15. 3. FLEXOR DIGITI MINIMI Origin : Hook of hamate and flexor retinaculum Insertion : proximal phalanx of 5th digit (little finger) Action : flexes little finger Innervation deep branch of ulnar nerve

16. 4. OPPONENS DIGITI MINIMI Origin : flexor retinaculum Insertion : Medial border of 5th metacarpal Action : Brings little finger (5th digit) into opposition with thumb Innervation deep branch of ulnar nerve

17. 3. Four lumbricals. 4. Four palmar interossei. 5. Four dorsal interossei.

18. 3. LUMBRICAL MUSCLES (four) They are named as such because of their elongated wormlike form Lumbricals 1 and 2 O r i g i n : l a t e r a l 2 t e n d on s o f flexor digitorum profundus Lumbricals 3 and 4 O rigin: medial 3 tendons of flexor digitorum profundus Insertion: lateral sides of extensor expansions of digits 2 to 5 A ction: To flex digits at MCP joints and extend IP joints

19. (a) The dorsal interossei muscles, and (b) palmar interossei muscles

20. The origin of the lumbrical muscles from tendons of flexor digitorum profundus (Layer 2 of palm)

21. (a) The dorsal interossei muscles, and (b) palmar interossei muscles

22. Test for palmar interossei Testing adductor pollicis

23. Thenar, midpalmar, dorsal subcutaneous and dorsal subaponeurotic spaces. I, II, III, IV—dorsal interossei and 1, 2, 3, 4—palmar interossei

24. Thank you