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Animal Health Science 1 > Thoracic muscles AHS1 > Flashcards

Thoracic muscles AHS1 Flashcards

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Biology 101 flashcards
1
Q

What are the main bony landmarks?

A

Cranial and caudal angle of the scapula Olecranon (front leg) Costal arch Tuber coxae

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2
Q

What shows the dorsal boundary of the scapula?

A

A line from the tuber coxae to the caudal border of the scapula

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3
Q

What is the thin muscle that covers the trunk region?

A

Cutaneous trunci

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4
Q

What is the reflex that causes the skin twitch?

A

Panniculus reflex

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5
Q

What is the layer that covers the muscles called?

A

Deep fascia/epimysium

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6
Q

What are the septa?

A

They divide muscles into functional groups, extend deep into the muscles and can carry infection

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7
Q

What are the 2 parts that the brachiocephalicus is divided into?

A

Cleidocephalicus and cleidobrachialis

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8
Q

What is the function of brachiocephalicus?

A

Protraction of the foreleg

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9
Q

Where does omotransversarius insert?

A

On the shoulder

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10
Q

Where does omotransversarius originate?

A

The transverse processes of the cranial cervical vertebrae

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11
Q

What is the function of omotransversarius?

A

Protraction of the forelimb

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12
Q

Where does trapezius originate?

A

The median/midline of the neck

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13
Q

Where does trapezius insert?

A

On the scapula

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14
Q

What is the function of trapezius?

A

Raises the scapula to protract the forelimb

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15
Q

Where does the latissimus dorsi originate?

A

In the deep fascia

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16
Q

Where does the latissimus dorsi insert?

A

On the caudal aspect of the humorous

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17
Q

What is the function of latissimus dorsi?

A

Retraction

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18
Q

Where do the pectoral muscles originate?

A

The sturnum

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19
Q

Where do the pectoral muscles insert?

A

On the medial aspect of the humorous

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20
Q

What is the function of the pectoral muscles?

A

Adduction of the forelimb

Sling to hold the body up

21
Q

Where does serratus ventralis originate?

A

On the ventral parts of the ribs

22
Q

Where does serratus ventralis insert?

A

On the medial aspect of the scapula

23
Q

What is the function of serratus ventralis?

A

Known as a girdle muscle - acts as a sling to hold the body between the forelimbs
Not a part of respiration - is an extrinsic muscle

24
Q

What are the respiratory muscles?

A

Serratus dorsalis

Scalenous

25
Q

What are the two parts of serratus dorsalis?

A

Serratus dorsalis cranialis

Serratus dorsalis caudalis

26
Q

Where does serratus dorsalis originate?

A

The dorsal deep fascia

27
Q

Where does serratus dorsalis insert?

A

On the proximal parts of the ribs

28
Q

What is the function of serratus dorsalis cranialis?

A

It raises the rib cage

29
Q

What is the function of serratus dorsalis caudalis?

A

It pulls the caudal part of the ribs downwards, so is active in expiration

30
Q

Where does scalenus originate?

A

On the cervical vertebrae

31
Q

Where does scalenus insert?

A

On the first 2 ribs

32
Q

What is the function of scalenus?

A

It stabilises the ribcage and draws the ribcage forward in inspiration

33
Q

Which intercostal muscles are involved in inspiration?

A

External intercostal muscles

34
Q

Which way do the muscle fibres run in the external intercostal muscles?

A

Caudoventrally \\\\ (backward and down)

They pull ribcage up and out

35
Q

Which way do the muscle fibres run in the internal intercostal muscles?

A

Cranioventrally ///////// (forward and down)

They pull the ribs together

36
Q

What are the segmental nerves?

A

The nerves that run down the ribs and to the epaxial muscles from the rami

37
Q

What do the nerves in the dorsal ramus supply?

A

Dorsal muscles like the epaxial muscles

Skin

38
Q

What do the nerves in the ventral ramus supply?

A

Run through the intercostal spaces on the caudal edge of each rib
Also known as intercostal nerves
Some supple the skin

39
Q

What is the order of tuff that runs along the caudal edge of the rib?

A

VAN
Vein
Artery
Nerve

40
Q

What makes up the diaphragm?

A

A middle tendinous region and a muscular periphery

41
Q

What are the 3 parts of the muscular periphery of the diaphragm?

A

The dorsal part, lateral/costal part and the ventral part

42
Q

What are crura of the diaphragm?

A

Leg like attachments to the vertebral column

43
Q

What are the epaxial muscles?

A

Wedges of muscle on either side of and dorsal to the spinal column

44
Q

What is the function of epaxial muscles?

A

Support the spine

Extend the vertebral column when they contract

45
Q

What are the two abdominal muscles?

A

Rectus abdominis

External abdominal oblique

46
Q

What are the rectus abdominis?

A

Abs

Run from the last ribs/sternum to the pelvis

47
Q

What is the function of rectus abdominis?

A

Hold the gut contents in

48
Q

What is the external abdominal oblique?

A

A sheet like muscle that holds guts in

Has a thin aponeurosis

49
Q

What is an aponeurosis?

A

A thin sheet like tendon

Animal Health Science 1 (33 decks)

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