Week 1: Muscles of the Thoracic Limb (Origins, Insertions, Actions) Flashcards

1
Q

Two parts of the superficial pectoral

A

pectoralis transversus

pectoralis descendens

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2
Q

Origin of the superficial pectoral (2)

A

First three sternebrae

median fibrous raphe at the ventral midline

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3
Q

Insertion of the superficial pectoral

A

Crest of the greater tubercle of the humerus

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4
Q

Action of the superficial pectoral (2)

A
Adduct limb (non-weight bearing)
prevent abduction of limb (weight bearing)
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5
Q

Origin of the deep pectoral (2)

A

Ventral part of the sternum

Median fibrous raphe at the ventral midline

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6
Q

Insertion of the deep pectoral (2)

A

Lesser tubercle of the humerus (major portion of insertion)

Greater tubercle and crest of the humerus via aoneurosis

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7
Q

Action of the deep pectoral (3)

A

Pull trunk cranially when limb is advanced and fixed
Extend shoulder
Draw limb caudally when not supporting weight

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8
Q

Two parts of brachiocephalicus

A

cleidobrachialis and cleidocephalicus

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9
Q

Two parts of the cleidocephalicus

A

cleidomastoideus and cleidocervalicus

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10
Q

Brachiocephalicus origin

A

clavicular intersection

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11
Q

Brachiocephalicus insertion (3)

A

Distal end of cranial humerus
Middorsal fibrous raphe of the neck
Mastoid process of the temporal bone

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12
Q

Brachiocephalicus action (3)

A

Advance the limb
Extend the shoulder
Draw head to the side of the neck

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13
Q

Lymph node associated with the omotransversarius

A

The superficial cervical lymph node

also called the pre-scapular lymph node

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14
Q

Omotransversarius origin

A

Wing (transverse process) of the atlas (cervical vertebrae 1)

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15
Q

Omotransversarius insertion

A

Distal end of the spine of the scapula

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16
Q

Omotransversarius action (2)

A

Advance the limb

Flex the neck laterally

17
Q

Two parts of the trapezius

A

Cervical trapezius

Thoracic trapezius

18
Q

Trapezius origin (2)

A

Median fibrous raphe of the neck

Supraspinous ligament

19
Q

Trapezius insertion

A

Spine of the scapula

20
Q

Trapezius action (2)

A

elevate and abduct limb

21
Q

Three parts of the rhomboideus

A

rhomboideus capitis
rhomboideus cervicis
rhomboideus thoracis

22
Q

Rhomboideus origin (3)

A

Base of skull (nuchal crest of occipital bone)
Median fibrous raphe of neck
Spinous processes of thoracic vertebrae

23
Q

Insertion of rhomboideus

A

Dorsal border of the scapula

24
Q

Action of the rhomboideus (2)

A

Elevate limb

Draw scapula against trunk

25
Latissimus dorsi origin (2)
Thoracolumbar fascia | Last few ribs
26
Latissimus dorsi insertion
Teres major tuberosity of the humerus via the teres major tendon
27
Latissimus dorsi action (2)
draw the limb caudally | Flex shoulder
28
Serratus ventralis can be referred to as what kind of muscle
sling muscle
29
Origin of the serratus ventralis (2)
Ribs | Transverse processes of cervical vertebrae
30
Insertion of serratus ventralis
Serrated face of the scapula
31
Action of the serratus ventralis (2)
Support trunk | Depress scapula
32
Origin of the deltoideus
Spine and acromion of the scapula
33
Insertion of the deltoideus
Deltoid tuberosity of the humerus
34
Action of the deltoideus
Flex shoulder
35
Infraspinatus muscle has what bursa associated with it?
Subtendinous synovial bursa
36
Infraspinatus origin
infraspinous fossa of the scapula
37
Infraspinatus insertion
lateral side of the greater tubercle of the humerus
38
Infraspinatus action (4)
Laterally stabilizes the shoulder (prevents medial rotation while weight bearing) Abduct and laterally rotate shoulder Assists other muscles in the extension or flexion of the shoulder