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Thoracic Limb - EXT

Extrinsic muscles of the pectoral/thoracic limb

QuestionAnswer
Cutaneus trunci ORIGIN - fascia of trunk INSERTION - Pectoralis profundus caudal border ACTION - tenses the skin FORM - very thin layer of m. and CT POSITION - deep to skin, thoracic and lumbar region
Brachiocephalicus- cleidobrachialis ORIGIN - clavicular tendon INSERTION - distal end cranial surface of humerus ACTION - extend shoulder, lateral flexion of neck (unilateral), fix neck (bilateral) FORM - flat m. POSITION - ventral part of braciocephalicus
Brachiocephalicus - cleidocervicalis ORIGIN - clavicular tendon INSERTION - dorsal neck/cervical vertebrae ACTION - extend shoulder, lateral flexion of neck (unilateral), fix neck (bilateral) FORM - flat m. POSITION - dorsal part of brachiocephalicus
Brachiocephalicus (overall) ORIGIN - clavicular tendon INSERTION - depends on which part of muscle ACTION - draw limb cranially, fix neck (bilaterally) FORM - long, flat m. POSITION - extends between brachium and neck
Clavicular tendon FORM - band of white connective tissue POSITION - between cleidobrachialis and cleidocervicalis parts of brachiocephalicus
Brachiocephalicus - cleidomastoideus ORIGIN - clavicular tendon INSERTION - mastoid part of temporal bone ACTION - extend shoulder, lateral flexion of neck (unilateral), fix neck (bilateral) FORM - narrow flat m. POSITION - continuation of cleidocervicalis up to head
Omotransversarius ORIGIN - distal scapula spine INSERTION - caudal border wing of atlas ACTION - draw limb cranially FORM - flat narrow m. POSITION - lateral to cervical vertebrae, ventral end attached to trapezius, dorsal end deep to cleidocervicalis
Trapezius (two parts) ORIGIN - pars cervicalis = cervical vertebrae, pars thoracica = thoracic vertebrae INSERTION - spine of scapula ACTION - elevate and draw limb cranially/abduction, rotate scapula FORM - flat triangular shape POSITION - deep to skin
Rhomboideus ORIGIN - pars thoracic = spinous processes T4-T6/7 pars cervicalis = spinous processes C2-3, pars capitus = nucal crest of occiput on skill INSERTION = dorsal border/caudal angle scapula ACTION - elevate limb, draw scapula to body
Rhomboideus - position (didn't fit on other card) POSITION - deep to trapezius
Latissimus dorsi ORIGIN - thoracolumbar fascia INSERTION - aponeurosis to tendon of m. teres major and m. pectoralis profundus ACTION - draw limb caudal, adduct limb, shoulder flexion FORM - very large, flat m. POSITION - dorsal half of thoracic cavity
Serratus ventralis ORIGIN - pars thoracic = T1 - T7/8, pars cervicalis = C3 - 7 INSERTION - serrated scapula surface ACTION - support limb in swing phase, depress scapula FORM - fan like, serrated ends POSITION - deep to scapula
Pectoralis profundus ORIGIN - sternum INSERTION - lesser tubercle humerus ACTION - draw limb caudally, extend shoulder
Pectoralis superficialis ORIGIN - 1st and 2nd sternebra INSERTION - greater tubercle humerus ACTION - adduction of limb
Created by: tazza261
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