8/4/2019 Lab Dissection I

1/2

Lab Dissection I

Anatomy

STARLET RHONADEZ B. ORIEL ~ 1 ~ CPU MD

PECTORAL REGION

O I A N

Pectoralis Major Clavicular portion medial half ofclavicleSternocostal portion sternum &upper 6 costal cartilages

Lateral lip of the bicipital groove ofhumerus

Adduction & Medial Rotation of Arm Clavicular part:Lateral PectoralNerveSternocostal part:Medial Pectoral Nerve

Pectoralis Minor 3rd 5th ribs Coracoid process of the scapula - Pulls the shoulder downward &forward;- elevates the ribs if the shoulder is fixed

Medial Pectoral Nerve

Subclavius 1st costal cartilage Clavicle Depresses the Clavicle Nerve to Subclavius

Serratus Anterior Outer surfaces of the upper 8 ribs Anterior surface of the medial borderof the scapula

- Protracts the medial border of scapula- Rotates the scapula upward- Elevates the ribs during forcedinspiration

Long Thoracic Nerve

SCAPULA

Deltoid Anterior fibers Lateral 3rd ofanterior border of clavicleMiddle (acromial) fibers Lateralborder of the acromion processPosterior fibers Lower border ofthe spine of scapula

Deltoid tuberosity of the humerus Acromial fibers: abducts the armAnterior fibers: Flexion & MedialRotation of ArmPosterior Fibers: Extension & LateralRotation of Arm

Axillary Nerve

Supraspinatus Supraspinous fossa of the scapula Upper facet of the greater tuberosity ofthe humerus

Assist deltoid in Abduction of Arm

Suprascapular NerveInfraspinatus Infraspinous fossa of the scapula Middle facet of the greater tuberosityof the humerus

Strongest Lateral Rotator of Arm

Subscapularis Subscapular fossa of the scapula Lesser Tuberosity of the humerus Medial Rotation of Arm Upper & LowerSubscapular Nerves

Teres Major Upper 2/3 of the posterior surface ofthe lateral border of the scapula

Lower facet of the greater tuberosity ofthe humerus

Lateral Rotation of Arm Axillary Nerve

Teres Minor Lower 2/3 of the posterior surface of

the lateral border of the scapula

Medial lip of the bicipital groove of the

humerus

Medial Rotation & Adduction of Arm Lower Subscapular

NerveANTERIOR ARM

Biceps brachii Long head Supraglenoid tubercleShort head Coracoid process ofthe scapula

- Radial Tuberosity- Deep fascia of the forearm viabicipital aponeurosis

- Flexion of shoulder & elbow joint- Supinates forearm Musculocutaneous

Nerve

(small part radialnerve)

Coracobrachialis Coracoid process Middle of the medial side of thehumerus

- Flexion & Adduction of Arm

Brachialis Front of lower half of the humerus Coronoid process of ulna - Flexion of elbow joint (true flexor ofelbow)

POSTERIOR ARM

Triceps brachii Long head Infraglenoid tubercleLateral head Posterior surface ofthe humerus above the spiral grooveMedial head - Posterior surface ofthe humerus below the spiral groove

Olecranon process of the ulna Extension of elbow joint Radial Nerve

ANTERIOR FOREARM

SUPERFICIAL

Pronator teres Humeral head Medial epicondyleof humerusUlnar head Medial border ofcoronoid process of ulna

Lateral aspect of shaft of Ulna - Pronation of forearm- Flexion of forearm

Median NerveFlexor carpi radialisMedial epicondyle of humerus

Base of 2nd

& 3rd

Metacarpals Flexes & Abducts hand @ wrist jointsPalmaris longus - Flexor retinaculum

- Palmar aponeurosisFlexes hand

Flexor carpi ulnaris Humeral head Medial epicondyleof humerusUlnar head Medial aspect ofolecranon process & posterior borderof ulna

- Pisiform- Hook of Hamate- Base of 5

thMetacarpal

Flexes & Adducts hand @ wrist joints Ulnar Nerve

INTERMEDIATE

Flexor digitorumsuperficialis

Humeroulnar head Medialepicondyle of humerus; medialborder of coronoid process of ulna

Radial head

oblique line onanterior surface of radius

Middle phalanx of medial 4 fingers - Flexes middle phalanx of fingers- Assists in flexion of proximal phalanx &hand

Median Nerve

DEEP

Flexor digitorumprofundus

Anteromedial surface of shaft of ulna Distal phalanges of medial 4 fingers - Flexes distal phalanx of fingers- Assists in flexion of middle & proximalphalanges & wrist

Ulnar (medial)Median (lateral)

Flexor pollicislongus

Anterior surface of shaft of Radius Distal phalanx of thumb Flexes distal phalanx of thumbAnterior interosseusbranch of mediannerve

Pronator quadratus Anterior surface of shaft of Ulna Anterior surface of shaft of Radius Pronates Forearm

Palmaris Brevis Flexor retinaculumPalmar Aponeurosis

Skin of palm Corrugates skin to improve grip of palm Superficial branch ofUlnar nerve

Lumbricals Tendons of Flexor digitorumprofundus

Extensor expansion of medial 4 fingers - Flex metacarpophalangeal joints- Extend interphalangeal joints of fingersexcept thumb

Lateral 2 MedianNerveMedial 2 UlnarNerve

HAND

8/4/2019 Lab Dissection I

2/2

Lab Dissection I

Anatomy

STARLET RHONADEZ B. ORIEL ~ 2 ~ CPU MD

O I A N

Palmar Interossei(4)

1st

palmar: base of 1st

metacarpal3: anterior surface of shafts of2

nd,3

rd,4

th,5

thmetacarpals

Proximal phalanges of thumb, index,ring & little fingers & dorsal

- Adduct fingers toward center of 3rd

finger- Flex metacarpophalangeal &interphalangeal joints

Deep branch of UlnarNerve

Dorsal Interossei (4) Contiguous sides of shafts ofmetacarpals

Proximal phalanges of index, middle &ring finger & dorsal extensorexpansion

- Abduct fingers from center of 3rd

finger- Flex metacarpophalangeal &interphalangeal joints

THUMB

Abductor pollicisbrevis

Scaphoid, trapezium, flexorretinaculum

Base of proximal phalange of thumb Abducts thumb

Median nerveFlexor pollicis brevis Flexor retinaculum Flexes metacarpophalangeal joint ofthumb

Oppones pollicis Shaft of metacarpal Pulls thumb medially & forward acrosspalm

Adductor pollicis Oblique head: 2nd

& 3rd

metacarpalsTransverse head: 3

rdmetacarpal

Base of proximal phalanx of thumb Adducts thumb Deep branch of Ulnarnerve

LITTLE FINGER

Abductordigitiminimi

Pisiform Base of proximal phalanx of little finger Abducts little fingerDeep branch of UlnarnerveFlexor digitiminimi

Flexor retinaculumFlexes little finger

Opponensdigitiminimi

Medial border of 5th

metacarpal Pulls 5th

metacarpal forward as incupping palm

LATERAL FASCIAL FOREARM

Brachioradialis Lateral supracondylar ridge ofhumerus

Base of styloid process of radius - Flexes elbow at elbow joint- Rotates forearm to midprone position

Radial NerveExtensor carpiradialis longus

Base of 2nd

metacarpal Extends & abducts hand & wrist joint

POSTERIOR FOREARM

SUPERFICIAL

Extensor carpiradialis brevis

Lateral epicondyle of humerus

Posterior surface of the base of 3rd

metacarpal

Extends & abducts hand & wrist

Deep branch of radialnerve

Extensor digitorum Middle & distal phalanges of medial 4fingers

Extends fingers & hand

Extensor digitiminimi

Extensor expansion of little finger Extends metacarpophalangeal joint oflittle finger

Extensor carpiulnaris

Base of 5th

metacarpal Extends & adducts hand @ wrist joint

Anconeus Lateral surface of olecranon process ofulna

Extends elbow joint (assist triceps) Radial Nerve

DEEP

Supinator Lateral epicondyle of humerus,anular ligament of proximalradioulnar joint & ulna

Neck & shaft of radius Supination of forearm

Deep branch of radialnerve

Abductor pollicislongus

Posterior surface of shaft of radius &ulna

Base of 1st

metacarpal Abducts & extends thumb

Adductor pollicis

longusExtensor pollicisbrevis

Posterior surface of shaft of ulna

Base of proximal phalange of thumb Extends proximal phalanx & metacarpalof thums

Extensor pollicislongus

Base of distal phalange of thumb Extends distal phalange of thumb

Extensor indicis Extensor expansion of index finger Extends metacarpophalangeal joint ofindex finger & wrist