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17 Cards in this Set
- Front
- Back
Intrinsic Muscles of the Hand
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1) Intrinsic hand muscles are those that locates entirely within the hand
2) extrinsic hand muscles are muscles located in the forearm that send their tendons into the hand and serve too move the digits or the hand at the wrist |
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Compartments of the Hand
x 4 1) Thenar Compartment |
- contains 1st metatarsal bone & intrinsic muscles for the thumb
a) flexor pollicis brevis, abductor pollicis brevis, opponens pollicis muscles |
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Compartments of the Hand
x 4 2) Hypothenar Compartment |
- contains intrinsic muscles for the little finger
a) flexor digiti minimi, abductor digiti minimi, opponens digiti minimi muscles |
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Compartments of the Hand
x 4 3) Central Compartment |
- contents
a) 4 metacarpal bones (#2-5) b) dorsal & palmar interosseous muscles c) adductor pollicis muscle d) tendons of flexor digitorum superficialis & flexor digitorum profundus muscle e) lumbrical muscles |
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Compartments of the Hand
x 4 Palmar Aponeurosis |
- dense fascia layer found immediately under skin of palm
a) forms the roof of central compartment b) serves as insertion for Palmaris Longus muscle |
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Movements of the fingers (digits 2-5)
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1) movements at metacarpal-phalangeal joint: flexion-extension, abduction-adduction, & circumduction of fingers
a) abduction = spread fingers b) adduction = bringing fingers together 2) interphalangeal joints allow for flexion-extension only |
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Movements of the thumb
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1) flexion-extension - bending thumb toward-away from palm (away position forms 90 degree angle with index finger, in same plane as palm)
2) abduction-adduction - moving thumb anteriorly (perpendicular to palm) & posteriorly (toward-against) index finger 3) opposition - bringing pad of thumb to pad of little finger |
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Muscles of the Thenar Compartment
x 3 |
-- have origin from lateral carpal bones
-- all insert onto lateral side of thumb (muscles run parallel to 1st metacarpal bone) -- all innervated by Median Nerve (after it passes through carpal tunnel) |
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1) Abductor Pollicis Brevis Muscle
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Action - abducts thumb (with Abductor Pollicis Longus muscle of posterior forearm)
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2) Flexor Pollicis Brevis Muscle
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Action - flexes thumb (with flexor pollicis longus muscle of anterior forearm)
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3) Opponens Pollicis Muscle
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- located deep to abductor & flexor pollicis brevis muscles
Action - opposition of thumb ( pulls 1st metacarpal across palm of hand) |
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Thumb Muscles of Central Compartment
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1) Adductor Pollicis Longus
Origin - from metacarpal & carpal bones of central palm Insert - medial side of thumb Innerv - ulnar nerve Action - adducts thumb -- strong muscle used during grasping -- forms anterior side of thumb (first) web space -- not located in thenar compartment - not innervated by median nerve |
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Muscles of the Hypothenar Compartment
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-- having origin from carpal bones of medial wrist & insert into medial side of little finger
-- all innervated by ulnar nerve 1) Abductor Digiti Minimi Action - abducts 5th digit 2) Flexor Digiti Minimi Muscle Action - flexes 5th digit 3) Opponens Digiti Minimi Muscle - located deep to abductor & flexor digiti minimi muscles Action - bring little finger into opposition with thumb |
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Muscles of the Central Compatment
x 3 |
-- tendons of Flexor Digitorum Superficialis & Flexor Digitorum Profundus pass through central compartment
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1) Lumbrical Muscles (four)
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origin - tendons of flexor digitorum profundus muscle
Insert - into extensor expansions of digits 2-5 Innerv - a) lumbricals 1 & 2 (lateral palm) - Median Nerve b) lumbricals 3 & 4 (medial palm) - Ulnar nerve Action - a) flex metacarpal-phalangeal joints (muscles cross palmar side of joint) b) extend interphalangeal joints (via insertion into extensor expansion) |
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2) Dorsal Interosseous Muscles
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Origin - metacarpal bones
Insert - proximal phalanx Innerv - ulnar nerve Action - abduct fingers - DAB (dorsal - abduct) -- first muscle forms posterior side of thumb web space |
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3) Palmar Interosseous Muscles
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origin - metacarpals
Insert - proximal phalanx Innerv - ulnar nerve Action - adducts fingers - PAD (palmar - adduct) |