Extrinsic Muscles of the Thoracic Limb Flashcards
Superficial Pectoral (Descending and Transverse Pectoral) Origin Insertion Action Innervation
Origin: -D: first sternabra
-T: 2-3 sternabrae
Insertion: D & T: crest of greater tubercle of humerus
Action: -w/ weight: adducts limb
-w/o weight: Prevents abduction of limb
Innervation: spinal nerves C7 and C8
Deep Pectoral Muscle
Origin
Insertion
Action
Innervation
Origin: Ventral part of sternabrae
-Deep fascia in xiphoid cartilage (caudal end of sternum)
Insertion: -Lesser tubercle of humerus
- Aponeurosis to greater tubercle & crest
Action:-w/ weight: Pulls trunk cranially & extends shoulder joint
- w/o weight: draws limb caudally & flex shoulder joint
- Adduct limb
Innervation:
Caudal pectoral nerves (C8,T1)
Brachiocephalicus
parts?
intersection?
in cats?
Origin
Insertion
Action
Innervation
- cleidocephalicus
- contains pars
mastoideous and
cervicalis
- contains pars
- cleidobrachialis
in cats the clavicle bone is embedded in here
Origin: clavicular intersection
Inerstion: 1.Cleidocephalicus: neck
- Pars mastoideus: mastoid process of skull
- Pars cervicalis: mid-dorsal fibrous raphe of neck
- Cleidobrachialis: humerus
Action:
- advance the limb
- extend the shoulder joint
- draw the neck and head to the side
Innervation:
accessory nerve and cervical spinal nerves
Omotransversarius
Insertion
Action
Innervation
Origin:
(wing) of the atlas C1
Action:
- to advance the limb
- flex the neck laterally
Innervation:
Accessory nerve
Trapezius Parts? Where is it attached to the scapula? Action Innervation
Thoracic and cervical
Insertion: the spine of the scapula
Action: elevate and abduct the forelimb
Innervation:
Accessory nerve
Rhomboideus
Parts?
Action
Innervation
contains rhomboideus capitis, cervicis, and thoracis
Action:
- elevate the forelimb
- draw the scapula against the trunk
Innervation: cervical and thoracic spinal nerves
Latissimus Dorsi
Origin
Insertion
Action
Innervation
Origin:
- Thoracolumbar fascia from spinous process of lumbar & last 7-8 thoracic vertebrae
- Muscular attachment to last 2-3 ribs
Insertion:
- the teres major tuberosity of the humerus
- the teres major tendon
Action:
- to draw the free limb caudally (digging)
- to flex the shoulder joint
Innervation: thoracodorsal nerve (C7, C8, T1)
Serratus Ventralis
Parts Origin Insertion Action Innervation
Parts:
Serratus ventralis cervicis and thoracis
Origin:
- transverse process of the last cervical vertebrae
- the first 7 or 8 ribs ventral to their middle
Insertion: serrated face
Action:
- to support the trunk
- depress the scapula
Innervation: cervical spinal nerves and the long thoracic nerve
Thoracolmbar fascia
- deep fascia of the trunk
Linea Alba
ventral midline along a median fibrous raphe
Carotid Sheath
deep fascia that covers the common carotid artery, vagosympathetic trunk, internal jugular vein, and tracheal lymphatic trunk
Median Raphe of the neck
- longitudinal fibrous septum between the right and left epaxial muscles
- serves as attachment to cervical muscles
Sternocephalicus
Parts?
Action?
Innervation?
Pars mastoidueus and occipitalis
Action:
- draw the head and neck to the side
Innervation: accessory nerve and cervical spinal nerves
Sternohyoideus
Action?
Innervation?
Action: to pull the tongue and larynx caudally
Innervation: cervical spinal nerves
Sternothyroideus
Action?
Innervation?
Action: pull the tongue and larynx caudally
Innervation: cervical spinal nerves and hypoglossal nerve
