Transcript Hand
Hand • • • • Bones Joints Muscles Vessels & Nerves 1 Muscles of the hand • Extrinsic muscles - flexors of fingers - extensors of fingers - long muscles of the thumb • Intrinsic muscles - thenar region - hypothenar region - intermediate region 2 Extrinsic muscles • flexors of fingers: - Flexor digitorum superficialis - Flexor digitorum profundus • extensors of fingers: - Extensor digitorum - Extensor digiti minimi - Extensor indicis • long muscles of the thumb: - Flexor pollicis longus - Abductor pollicis longus - Extensor pollicis brevis - Extensor pollicis longus 3 Intrinsic muscles • Thenar region: - Abductor pollicis brevis - Flexor pollicis brevis - Opponens pollicis • Hypothenar region: - Abductor digiti minimi - Flexor digiti minimi brevis - Opponens digiti minimi • Intermediate region: - Lumbricals - Adductor pollicis - Interossei 4 Extrinsic muscles (flexors) 5 Long flexors of fingers 6 Flexor tendon insertion Action: flexion in MP&IP joints How can we flex just MP? 7 Muscles of the Anterior Compartment of the Forearm • Superficial: Pronator Teres Flexor Carpi Radialis Palmaris Longus Flexor Digitorum Superficialis Flexor Carpi Ulnaris • Deep: Flexor Digitorum Profondus Flexor Pollicis Longus Pronator Quadratus 8 Extrinsic muscles (extensors) 9 Extrinsic muscles 10 Anatomic snuffbox 11 Anatomic Snuffbox • Extensor pollicis brevis/Abductor pollicis longus • Extensor pollicis longus • Scaphoid • Radial a 12 Extensor tendon insertion 13 Post.Compartment m. Superficial: Brachioradialis Extensor Carpi Radialis Longus Extensor Carpi Radialis Brevis Extensor Digitorum Extensor Digiti Minimi Extensor Carpi Ulnaris Anconeus Deep: Supinator Abductor Pollicis Longus Extensor Pollicis Brevis Extensor Pollicis Longus Extensor Indicis 14 Intrinsic muscles • Thenar region: - Abductor pollicis brevis - Flexor pollicis brevis - Opponens pollicis • Hypothenar region: - Abductor digiti minimi - Flexor digiti minimi brevis - Opponens digiti minimi • Intermediate region: - Lumbricals - Adductor pollicis - Interossei 15 Intrinsic muscles 16 henar & hypothenar muscles Insertion: 1- deep attaches to Metacarpal 2- superficial to P. Phalanx origin: 1. flex. retinaculum 17 thenar & hypothenar muscles 2. Origin of thenar & hypothenar muscles Trap. tubercle Ham. hook Scapho. tubercle Pisifo. 18 Intrinsic muscles • Thenar region: - Abductor pollicis brevis - Flexor pollicis brevis - Opponens pollicis • Hypothenar region: - Abductor digiti minimi - Flexor digiti minimi brevis - Opponens digiti minimi • Intermediate region: - Adductor pollicis -Lumbricals -Interossei 19 Intermediate region Adductor pollicis 20 Intermediate region Dorsal Interossei Function: Dab 21 Intermediate region Palmar Interossei Function: Pad 22 Intermediate region lumbricals Function: MP flex. ! 23 Intermediate region muscles insertion: Extensor hood 24 25 Extensor & flexor mechanism 26 Tendon insertion Function: MP flex. Action: •pad/dab •Flexion in MP and extension in IP joints How can we flex just MP? 27