Thoracic Limb- Extrinsic Muscles.txt

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Author:
Mawad
ID:
280963
Filename:
Thoracic Limb- Extrinsic Muscles.txt
Updated:
2014-08-20 14:35:50
Tags:
Thoracic Limb Canine
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Description:
Origin, Insertion, Action, Innervation
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  1. Superficial pectoral
    • Origin- First 2 sternebrae ( part of third); fibrous raphae b/w adjacent muscle.
    • Insertion- Whole crest of greater tubercle.
    • Action- To adduct the limb (non-weight bearing) and prevent abduction (weight-bearing).
    • Innervation- Cranial pectoral nerves.
  2. Deep pectoral
    • Origin- Ventral part of the sternum and fibrous raphae b/w fellow muscles; deep abdominal fascia by xyphoid cartilage.
    • Insertion- Major portion of lesser tubercle (humerus); aponeurosis to the greater tubercle (humerus); caudally to medial brachial fascia.
    • Action- When limb is advanced and fixed: to pull trunk cranially and extend shoulder joint; When limb is non-weight-bearing: to draw limb caudally an flex shoulder joint (adduct the limb).
    • Innervation- Caudal pectoral nerves.
  3. Brachiocephalicus
    • Attachments- Clavicular intersection (origin for naming purposes); cleidobrachialis~distal end of cranial border of humerus; cleidocephalicus (cervically)~cranial half of mid-dorsal fibrous raphae; cleidocephalicus (mastoidally)~mastoid part of temporal bone w? sternomastoideus muscle.
    • Action- To advance limb; to extend shoulder joint; to draw neck and head to the side.
    • Innervation- Accessory nerve and ventral branches of cervical spinal nerves.
  4. Sternocephalicus
    • Origin- The manubrium.
    • Insertion- The mastoid part of the temporal bone; the nuchal crest of the occipital bone.
    • Action- To draw the head and neck to the side.
    • Innervation- Accessory nerve and ventral branches of cervical spinal nerves.
  5. Sternohyoideus
    • Origin- Manubrium and first costal cartilage.
    • Insertion- Basihyoid bone.
    • Action- To pull tongue and larynx caudally.
    • Innervation- Ventral branches of cervical spinal nerves.
  6. Sternothyroideus
    • Origin- First costal cartilage.
    • Insertion- Caudolateral surface of the thyroid cartilage.
    • Action- To draw the tongue and larynx caudally.
    • Innervation- Ventral branches of the cervical spinal nerves.
  7. Omotransversarius
    • Attachments- Distal end of scapular spine; cranially, the transverse wing of the atlas.
    • Action- To advance the limb or flex the neck laterally.
    • Innervation- Accessory nerve.
  8. Trapezius
    • Origin- The median raphae of the neck and the supraspinous ligament from the 3rd cervical vertebra to the 9th thoracic vertebra.
    • Insertion- The spine of the scapula.
    • Action- To elevate and abduct the forelimb.
    • Innervation- Accessory nerve.
  9. Rhomboideus
    • Origin- The nuchal crest of the occipital bone; the median fibrous raphae of the neck; the spinous processes of the first 7 thoracic vertebrae.
    • Insertion- The dorsal border and adjacent surfaces of the scapula.
    • Action- To elevate the forelimb and draw the scapula against the trunk.
    • Innervation- Ventral branches of cervical and thoracic spinal nerves.
  10. Latissimus dorsi
    • Origin- The thoracolumbar fascia from the spinous processes of the lumbar and lat 7-8 thoracic vertebra; a muscular attachment to the last 2-3 ribs.
    • Insertion- The teres major tuberosity (humerus) and teres major tendon.
    • Action- To draw the free limb caudally as in digging; to flex the shoulder joint.
    • Innervation- Thoracodorsal nerve.
  11. Serratus ventralis cervicis
    • Origin- The transverse processes of the last 5 cervical vertebrae and the first 7-8 ribs ventrally.
    • Insertion- The dorsomedial third of the scapula (serrated face).
    • Action- To support the trunk and depress the scapula.
    • Innervation- Ventral branches of cervical spinal nerves and the long thoracic nerve.

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