Extrinsic Muscles of the Thoracic Limb

Question 1

those that attached the limb to the axial skeleton

Answer 1

Extrinsic muscles

Question 2

the muscles that are attached to the limb

Answer 2

Intrinsic Muscles

Question 3

extrinsic muscles of the thoracic limb (8)

Answer 3

• Superficial pectoral
• Deep pectoral
• Brachiocephalicus
• Omotransversarius
• Trapezius
• Rhomboideus
• Latissimus dorsi
• Serratus ventralis

Question 4

superficial pectoral m. is divided into 2;

Answer 4

descending pectoral
transverse pectoral

Question 5

superficial and smaller than transverse pectoral; innervated by cranial pectoral nerve;

Answer 5

descending pectoral

Question 6

arises from 1st 2 – 3 sternebrae and inserts into greater tubercle of humerus

Answer 6

transverse pectoral

Question 7

*Extrinsic muscle

to adduct the limb and prevent abduction when bearing weight

Answer 7

Superficial Pectoral m.

Question 8

*Extrinsic muscle

larger and longer than superficial pectoral; from cranial part of sternum and humerus

Answer 8

Deep pectoral m.

Question 9

*Extrinsic muscle

• adduction of limb
• to draw limb backwards or pull trunk forward

Answer 9

Deep pectoral muscle

Question 10

*3 sections of the brachiocephalicus

– attaches to the neck

Answer 10

Cleidocervicalis

Question 11

– attaches to the skull

Answer 11

Cleidomastoideus

Question 12

3 sections of brachiocephalicus

Answer 12

m. cleidobrachialis
m. cleidocervicalis
m. clediomastoideus

Question 13

O: Clavicle (vestigial) or clavicular intersection
I: distal third of the humerus
A: to advance the limb; to extend the shoulder and draw head and neck to the side

Answer 13

Brachiocephalicus

Question 14

• Innervated by accessory nerve and ventral branches of cervical spinal nerves
• clavicular intersection

Answer 14

Brachiocephalicus

Question 15

arises from the manubrium and inserts in the mastoid part of the temporal bone and the nuchal crest of the occipital bone; ventral part is closely united with cleidomastoideus;

Answer 15

Sternocephalicus

Question 16

*Sternocephalicus
cranial part divides into 2 parts:

Answer 16

– a. mastoid part– ventral part
– b. occipital part – dorsal part

Question 17

• Innervated by accessory nerve and ventral branches of cervical nerves.
• This is where the external jugular vein can be located

Answer 17

Sternocephalicus

Question 18

to draw the head and neck to the side (2)

Answer 18

sternomastoideus and
sternooccipitalis

Question 19

to draw the larynx and tongue caudally (2)

Answer 19

sternohyoideus and
sternothyroideus

Question 20

• straplike and extends from the distal end of the spine of scapula to the atlas;
• innervated by the accessory nerve

Answer 20

Omotransversarius

Question 21

cutting the OMOTRANSVERSARIUS at its middle will expose ____ ___ __ __

Answer 21

superficial cervical lymph nodes

Question 22

advance the limb and flex neck laterally

Answer 22

Omotransversarius

Question 23

– Strong wrapping that extends under the sternocephalicus, cleidomastoideus, omotransversarius and cleidocervicalis n.

Answer 23

Deep fascia of the neck

Question 24

– Deep fascia that covers the common carotid artery, vagosympathetic nerve trunk, internal jugular vein and lymphatic trunk

Answer 24

Carotid sheath

Question 25

– Connects the dorsal aspects of all vertebral spines except the cervical vertebrae

Answer 25

Supraspinous ligament

Question 26

– Extends from the spine of the first thoracic vertebra to the spine of the axis

Answer 26

Nuchal ligament

Question 27

– A longitudinal fibrous septum that serves as an attachment for many of the cervical muscles

Answer 27

Median raphe of
the neck

Question 28

*Extrinsic muscles

thin and triangular muscle with cervical and thoracic parts
* extends from the median raphe of the neck and the supraspinous ligament (C3 – T9) to the spine of scapula
* innervated by accessory nerve

Answer 28

Trapezius

Question 29

*Extrinsic muscles
*trapezius
elevate and abduct the forelimb

Answer 29

cervical trapezius

Question 30

*Extrinsic muscles
*trapezius
elevate and abduct the forelimb

Answer 30

thoracic trapezius

Question 31

*Extrinsic muscles

Innervated by ventral branches of cervical and thoracic nerves

Answer 31

Rhomboideus

Question 32

rhomboideus is divided into 3 parts:

Answer 32

capital
cervical
thoracic

Question 33

rhomboideus capitis

Answer 33

capital

Question 34

rhomboideus cervicis

Answer 34

Cervical

Question 35

rhomboideus thoracis

Answer 35

Thoracic

Question 36

to elevate the forelimb and draw scapula to the trunk

Answer 36

Rhomboideus

Question 37

*Extrinsic muscles

• large and roughly triangular;
• lies caudal to the scapula where it covers most of the dorsal and some of the lateral thoracic wall;
• innervated by thoracodorsal nerve

Answer 37

Latissimus dorsi

Question 38

*Extrinsic muscles

to draw limb caudally

Answer 38

Latissimus dorsi

Question 39

*Extrinsic muscles

• a large, fan-shaped muscle that acts as a sling to support the body between the limbs;
• from C5 transverse processes and first 7
  or 8 ribs to the serrated face of the scapula;
• innervated by ventral branches of cervical nerve and long thoracic nerve
• has cervical and thoracic parts

Answer 39

Serratus ventralis

Question 40

which part of serratus ventralis supports the trunk?

Answer 40

cervical part:

Question 41

*serratus ventralis

lateral surface of the ribs

Answer 41

thoracic part: