Extrinsic Muscles of the Thoracic Limb Flashcards Preview

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Flashcards in Extrinsic Muscles of the Thoracic Limb Deck (21)
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1

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

2

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)

3

Brachiocephalicus
parts?
intersection?
in cats?

Origin
Insertion
Action
Innervation

1. cleidocephalicus
- contains pars
mastoideous and
cervicalis

2. 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

2. 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



4

Omotransversarius

Insertion
Action
Innervation

Origin:
(wing) of the atlas C1

Action:
- to advance the limb
- flex the neck laterally

Innervation:
Accessory nerve

5

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

6

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

7

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)

8

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

9

Thoracolmbar fascia

- deep fascia of the trunk

10

Linea Alba

ventral midline along a median fibrous raphe

11

Carotid Sheath

deep fascia that covers the common carotid artery, vagosympathetic trunk, internal jugular vein, and tracheal lymphatic trunk

12

Median Raphe of the neck

- longitudinal fibrous septum between the right and left epaxial muscles
- serves as attachment to cervical muscles

13

Sternocephalicus
Parts?
Action?
Innervation?

Pars mastoidueus and occipitalis

Action:
- draw the head and neck to the side

Innervation: accessory nerve and cervical spinal nerves

14

Sternohyoideus
Action?
Innervation?

Action: to pull the tongue and larynx caudally

Innervation: cervical spinal nerves

15

Sternothyroideus
Action?
Innervation?

Action: pull the tongue and larynx caudally

Innervation: cervical spinal nerves and hypoglossal nerve

16

Cutaneous Trunchi
action
innervation
platysma (thickened neck portion)

twitches skin

innervated by lateral thoracic nerve

17

Superficial Fascia

Deep portion of subcutaneous tissue covering body

18

Deep Fascia

Firmly attached to muscle

19

Aponeurosis

Thin sheet of tendon

20

Tendon vs. Ligament

tendon- dense CT (collagen)

ligament - dense fibrous connective tissue between bones, connects organs-organs/trunk

21

costal arch

Costal cartilages of 10-12 ribs uniting