Extrinsic muscles of the forelimb Flashcards Preview

Anatomy > Extrinsic muscles of the forelimb > Flashcards

Flashcards in Extrinsic muscles of the forelimb Deck (12)
Loading flashcards...
1

Cervical part of Trapezium muscle

Origin: Median fibrous raphe of the neck,from the 3rd cervical to 7th cervical vertebra.

Insertion: scapular spine

Innervation: dorsal branch of the accessory

Action: Elevate and draw limb foreward

2

Thoracic part of Trapezium muscle

Origin: From the supraspinous ligament and thoracic dorsal spines 1-9.

Insertion: scapular spine

Innervation: dorsal branch of the accessory

Action: Elevate and draw limb foreward

3

Cervical part of Serratus Venrtalis

Origin: transverse processes of the last 3 cervical vertebrae

Insertion: serrated face of scapula

Innervation: ventral branches of the last 3 cervical spinal nerves.

Action: passive trunk support

4

Thoracic part of the Serratus Ventralis

Origin: Lateral surface of the first 8 ribs

Insertion: serrated face of scapula

Innervation: long thoracic nerve of the brachial plexus

Action: move scapula forward and backward

5

Omotransversarius

Origin: wing of the atlas

Insertion: Lower spine of scapula

Innervation: Accessory nerve

Action: Draws the scapula forward

6

Rhomboideus Capitis

Origin: Occipital bone of skull

Insertion: dorsal edge of scapula

Innervation: Ventral branches of 3‐7 cervical and 1‐6 thoracic spinal nerves.

Action: elevate the limb, move the scapula forward and pull it close to the trunk.

7

Rhomboideus (cervical)

Origin: Tendinousraphe of neck from the 3
rd cervical to the 7th cervical vertebrae; and spines of 1‐3 thoracic vertebrae.

Insertion: dorsal edge of scapula

Innervation: Ventral branches of 3‐7 cervical and 1‐6 thoracic spinal nerves.

Action: elevate the limb, move the scapula forward and pull it close to the trunk.

8

Rhomboideus (thoracic)

Origin: spines of 4th-6th thoracic vertebrae

Insertion: dorsal edge of scapula

Innervation: Ventral branches of 3‐7 cervical and 1‐6 thoracic spinal nerves.

Action: elevate the limb, move the scapula forward and pull it close to the trunk.

9

Latissiumus dorsi

Origin: From thoracodorsal fascia via an aponeurosis (and indirectly from the spinous
processes of the last 7 thoracic through lumbar vertebrae), lateral surface of the last 2‐3
ribs.

Insertion: Mainly to the teres tubercle on the medial shaft of the humerus.

Nerve supply: Mainly the thoracodorsal nerve from the brachial plexus.

Action:Draw the limb backwards, and flex the shoulder joint.

10

Brachiocephalicus (cleidobrachialis, cleidocervicalis, cleidomastoideus)

Attachments: Distal part of the humeral crest, to the cranial half of the cervical fibrous
raphe, and to the mastoid part of the skull.

Nerve supply: The cleidobrachialis part is supplied by a nerve from the brachial plexus
(brachiocephalicus), the cleidocephalicus is supplied by ventral branches of several cervical
nerves as well as the accessory (CNXI) nerve (specifically to the cleidomastoid part)

Action: extension of the limb and flexion of the neck

11

Superficial pectoral muscle (descending and transverse)

Origin: 1st 2 sternebrae and associated costal cartilage.

Insertion: Crest of major tubercle of the humerous.

Innervation: cranial pectoral nerve.

Action: adduction

12

Deep pectoral muscle

Origin: From all the sternebrae.

Insertion: Both greater and lesser tubercles of humerus.

Nerve supply: Mainly caudal pectoral nerves.

Action: Mainly adduction of the limb. Also pulls limb back and trunk forward.