intrinsic muscles of Hand.pptx
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The document discusses the intrinsic muscles of the hand, which comprise four groups: thenar, hypothenar, lumbricals, and interossei, totaling twenty muscles. It details the origin, insertion, innervation, and action of each muscle, highlighting their functions in gripping and fine movements. The specific muscles and their roles, including the abductor, flexor, and opponens of the thumb and little finger, are also described.
intrinsic muscles of Hand.pptx
- 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:- 1. Thenar 2. Hypothenar 3. Lumbricals 4. Interossei muscles There are 20 muscles in the hand
- 4. The planes of movements of the fingers
- 6. 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
- 7. Thenar Muscles a. Abductor pollicis brevis b. Flexor pollicis brevis c. Opponens pollicis d. Adductor pollicis
- 8. 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
- 9. 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
- 10. 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
- 11. 4. ADDUCTOR POLLICIS Origin: oblique head:- 2nd,3rd metacarpals transverse head: 3rd metacarpal Insertion: medial side of base of proximal phalanx of thumb Action: Adducts thumb Innervation ulnar nerve
- 12. 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.
- 14. 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
- 15. 2. ABDUCTOR DIGITI MINIMI The most superficial of the hypothenar muscles forming the hypothenar eminence Origin: Pisiform bone Insertion: proximal phalanx of 5th digit (little finger) Action: abducts little finger Innervation deep branch of ulnar nerve
- 16. 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
- 17. 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
- 18. 3. Four lumbricals. 4. Four palmar interossei. 5. Four dorsal interossei.
- 19. 3. LUMBRICAL MUSCLES (four) They are named as such because of their elongated wormlike form 1. Lumbricals 1 and 2 Origin: lateral 2 tendons of flexor digitorum profundus 2. Lumbricals 3 and 4 Origin: medial 3 tendons of flexor digitorum profundus Insertion: lateral sides of extensor expansions of digits 2 to 5 Action: To flex digits at MCP joints and extend IP joints
- 22. (a) The dorsal interossei muscles, and (b) palmar interossei muscles
- 25. The origin of the lumbrical muscles from tendons of flexor digitorum profundus (Layer 2 of palm)
- 27. (a) The dorsal interossei muscles, and (b) palmar interossei muscles
- 28. Test for palmar interossei Testing adductor pollicis
- 29. Thenar, midpalmar, dorsal subcutaneous and dorsal subaponeurotic spaces. I, II, III, IV—dorsal interossei and 1, 2, 3,
- 30. Thank you