Lab manual 5 pt.3 muscles of hand, scapular muscles of the thorax and back

what is the origin of the palmaris brevis?

palmar aponeurosis and flexor retinaculum

what is the insertion of the palmaris brevis?

dermis on the ulnar side of hand

what is the action of the palmaris brevis?

tenses the skin over the hypothenar muscles

what is the innervation of the palmaris brevis?

ulnar n., superficial branch (C8-T1)

what are the thenar muscles?

• abductor pollicis brevis

• flexor pollicis brevis

• opponens pollicis

what is the origin of the abductor pollicis brevis?

flexor retinaculum, scaphoid, and trapezium

what is the insertion of the abductor pollicis brevis?

proximal phalanx of digit 1

what is the action of the abductor pollicis brevis ?

abduction of thumb

what is the innervation of the abductor pollicis brevis ?

median n., recurrent branch (C8-T1)

what is the proximal and distal attachment of the flexor pollicis brevis?

• deep head: trapezuim and flexor retinaculum

• superficial head: trapezoid and capitate

what is the action of the flexor pollicis brevis?

flexion of digit 1 (metacarpophalangeal joint)

what is the innervation of the flexor pollicis brevis?

median n., recurrent branch (C8-T1)

what is the origin of the opponens pollicis ?

trapezium and flexor retinaculum

what is the insertion of the opponens pollicis ?

metacarpal 1

what is the action of the opponens pollicis ?

medial rotation of thumb and flexion of metacarpal of digit 1

what is the innervation of the opponens pollicis ?

median n., recurrent branch (C8-T1)

what is in the adductor compartment of the hand?

adductor pollicis

what is the origin of the adductor pollicis?

• oblique head: metacarpals 2 and 3 and capitates

• transverse head: metacarpal 3

what is the insertion of the adductor pollicis?

proximal phalanx of digit 1

what is the action of the adductor pollicis?

adduction of thumb

what is the innervation of the adductor pollicis?

ulnar n. deep branch (C8-T1)

what are the Hypothenar muscles?

• abductor digiti minimi

• flexor digiti minimi brevis

• opponens digiti minimi brevis

• opponens digiti minimi

what is the origin of the abductor digiti minimi?

pisiform bone, pisohamate ligament, and tendon of flexor carpi ulnaris

what is the insertion of the abductor digiti minimi?

proximal phalanx of digit 5

what is the action of the abductor digiti minimi?

abduction of digit 5

what is the innervation of the abductor digiti minimi?

ulnar n., deep branch (C8-T1)

what is the origin/ insertion of the flexor digiti minimi brevis?

hook of hamate and flexor retinaculum

what is the action of the flexor digiti minimi brevis?

flexion of metacarpophalangeal joint of digit 5

what is the innervation of the flexor digiti minimi brevis?

ulnar n., deep branch (C8-T1)

what is the origin/insertion of the opponens digiti minimi ?

metacarpal 5

what is the action of the opponens digiti minimi ?

lateral rotation of metacarpal 5

what is the innervation of the opponens digiti minimi ?

ulnar n., deep branch (C8-T1)

what is inside of the central compartment?

• lumbricals 1 and 2

• lumbricals 3 and 4

• dorsal interossei 1-4

• palmar interossei 1-3

what is the origin of the lumbricals 1 and 2 ?

lateral two tendons of flexor digitorum profundus

what is the insertion of the lumbricals 1 and 2 ?

lateral sides of dorsal digital expansions for digits 2-5

what is the action of the lumbricals 1 and 2 ?

flexes metacarpophalangeal joints and extends interphalangeal joints

what is the innervation of the lumbricals 1 and 2 ?

median n. (C8-T1)

what is the origin/insertion of the lumbricals 3 and 4?

medial two tendons of flexor digitorum profundus

what is the innervation of the lumbricals 3 and 4?

ulnar n., deep branch (C8-T1)

What is the origin of the dorsal interossei 1-4 ?

adjacent sides of metacarpals

What is the insertion of the dorsal interossei 1-4 ?

dorsal digital expansions and base of proximal phalanges of digitis 2-4

What is the action of the dorsal interossei 1-4 ?

abducts digits (DAB) and flexes metacarpophalangeal joints and extends interphalangeal joints

What is the innervation of the dorsal interossei 1-4 ?

ulnar n., deep branch (C8-T1)

what is the origin of the palamr interossei 1-3 ?

metacarpals 2, 4, and 5

what is the insertion of the palamr interossei 1-3 ?

dorsal digital expansions and base of proximal phalanges of digits 2, 4, and 5

what is the action of the palamr interossei 1-3 ?

adducts digits (PAD) and flexes metacarpophalangeal joints and extends interphalangeal joints

what is the innervation of the palamr interossei 1-3 ?

Ulnar n., deep branch (C8-T1)

what is the origin of the pectoralis minor origin?

ribs 3-5

what is the insertion of the pectoralis minor?

coracoid process of scapula

what is the action of the pectoralis minor?

protraction and stabiliztion of scapula

what is the innervation of the pectoralis minor?

medial pectoral n. (C8-T1)

what is the origin of the serratus anterior?

lateral border of ribs 1-8

what is the insertion of the serratus anterior?

medial margin of scapula

what is the action of the serratus anterior?

protraction and stabilization of scapula

what is the innervation of the serratus anterior?

long thoracic n. (C5-C7)

what is the origin of the subclavius?

rib 1

what is the insertion of the subclavius?

clavicle

what is the action of the subclavius?

stabilize the clavicle

what is the innervation of the subclavius?

nerve to subclavius (C5-C6)

what is the origin of the trapezius?

• upper fibers: superior nucal line, external occipital protuberance, nuchal ligament

• middle fibers: spinous processes of vertebrae C7-T3

• lower fibers: spinous processes of vertebrae T4-T12

what is the insertion of the trapezius?

• upper fibers: lateral third of clavicle

• middle fibers: acromion process, scapular spine

• lower fibers: medial end and root of scapular spine

what is the innervation of the trapezius?

accessory nerve (CN XI) and branches of C3-C4

what is the actions of the upper trapezius?

• elevation of scapula

• upward rotation of scapula (with lower traps)

• extension of the cervical spine - when acting bilaterally

• ipsilateral lateral flexion of the cervical spine

• contralateral rotation of the xervical spine and head

• (anterior tilt of scapula

what is the actions of the middle trapezius?

retraction of scapula

what is the actions of the lower trapezius?

• retractions of scapula

• depression of scapula

• upward rotation of scapula (with upper traps)

• (posterior tilt of scapula)

what is the origin of the levator scapulae?

transverse processess of vertebrae C1-C4

what is the insertion of the levator scapulae?

superior angle of the scapula

what is the innervation of the levator scapulae?

anterior/ventral rami of spinal nerves C3 and C4 Dorsal scapular nerve (C5)

what is the action of the levator scapulae?

• ipsilateral flexion of cervical spine

• ipsilateral rotation of cervical spine

• extension of cervical spine when acting bilaterally

• elevation of scapula

• weak downward rotation of scapula

what is the origin of the rhomboid minor?

nuchal ligament, spinous processes of vertebrae C7-T1

what is the origin of the rhomboid major?

spinous process of vertebrae T2-T5

what is the insertion of the rhomboid minor?

root of scapular spine

what is the insertion of the rhomboid major?

medial border of scapula

what is the innervation of the rhomboid muscles?

dorsal scapular nerve (C4-C5)

what is the actions of the rhomboid muscles?

• retraction of scapula

• downward rotation of scapula

• elevation of scapula