Hand Bones Joints Muscles Vessels Nerves 1 Muscles
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 Pisifo. Scapho. tubercle 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
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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
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