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Departement of Anatomy
Medical Faculty of North Sumatra University
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Muscle crosses joint Origin is usually proximal and insertion is
usually distal Origin is considered fixed in analyzing
muscle action Muscle action (concentric) is given by
movement of insertion relative to originacross joint
Remember: Sometimes insertion might be fixed Muscle may be active isometrically and
concentrically giving different real function duringreal activity
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Muscles of Scapula
If INSERTION onscapula, muscle movesscapula Trapezius
Rhomboids Pectoralis Minor
Serratus Ventralis
Levator Scapulae
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If ORIGIN on scapula, musclemoves arm
Teres Major Latissimus Dorsi (partially on scapula)
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Muscles originate on fossae of scapula
Help support open socket of shoulder joint Insert around ball of femur
Medial and lateral rotation of upper limb
Typical baseball pitcher injury
Supraspinatus
Infraspinatus
Teres minor
Subscapularis
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Region between arm and chest
Boundaries Ventral - pectoral muscles
Dorsal = latissimus dorsi, teres majorsubscapularis
Medial = serratus ventralis
Lateral = bicipital groove of humerus
ContentsAxillary nerves and blood vessels
Axillary lymph nodes Brachial plexus
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Posterior Compartmentposterior cord Anterior compartmentmedial, lateral cords
Name of cord is relative to axillary artery
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One posterior nerve
Radial n.
Three anterior nerves
Musculocutaneous n.
Median n.
Ulnar n.
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ANTERIOR POSTERIOR
NERVES M-C, ulnar,
median
Radial
MOVEMENT Flexion Extension
MUSCLES Biceps,
flexors
Triceps,
extensors
TWIST Flexors frommedial
epicondyle
Extensors fromlateral
epicondyle
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Bicepsanterior compartment, flexion (M-C n.)
Tricepsposterior compartment, extension (radial n.)
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Anterior Compartment Forearm--flexors
Flexor Carpi Radialis
Flexor Retinaculum
Medial Epicondyle
Flexor Digitorum Superficialis is deep to
other flexors
Flexor Carpi Ulnaris
Brachioradialis
Pronator Teres
Anterior View
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Posterior Compartment of Forearm--extensors
Extensor digitorum
Extensor carpi ulnarisExt Carpi Radialis Longus
Brachioradialis
Lateral Epicondyle
Posterior View
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ANTERIOR MUSCLES
M-C nerve Biceps
brachialis
Median nerve Forearm flexors
Thumb intrinsics (1M$ nerve)
Ulnar nerve
Flexor carpi ulnaris Hand intrinsics
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POSTERIOR MUSCLES
Muscles (radial nerve) Triceps
Anconeus
Brachioradialis
Carpal, digit extensors
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Dermatomesextend over limbs
Named nervesgenerally innervateskin over musclesthat they innervate
Frolich, Human Anatomy,UpprLimb
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M-C: between biceps brachii and brachialisMedian: medial/posterior to biceps,
branches into forearm flexors at elbow thento hand through carpal tunnel
Ulnar: medial in arm, posterior to medialepicondle of humerus (funny bone) downmedial forearm medial to carpal tunnel intopalm
Radial: deep posterior arm around lateralepicondyle of humerus to forearm (deep andsuperficial branches)
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Ulnar Nerve
Brachial Artery
Median Nerve
Ulnar Nerve
Median Nerve
Radial Artery
Musculocutaneous Nerve UlnarArtery
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Biceps + Tricepsbrachii Olecranon Process Medial Epicondyle Cubital Fossa Anterior surface elbow Contents
Brachial Artery Median Nerve
Boundaries Medial = Pronator teres Lateral = Brachioradialis Superior = Line between
epicondyles
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Carpal Tunnel
Carpals concave anteriorly
Carpal ligament covers it
Contains: long tendons,Median nerve
Inflammation of tendons =compression of Median
nerve Anatomical Snuffbox
Lateral = E.pollicis brevis
Medial = E. pollicis longus
Floor = scaphoid, styloid of
radius Contains Radial Artery
(pulse)
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