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First Year Term 1 > Forelimb extrinstic muscles > Flashcards

Forelimb extrinstic muscles Flashcards

1
Q

List the extrinsic muscles

A
  1. Superficial pectoral
  2. deep pectoral
  3. Latissimus Dorsi
  4. Serratus ventralis
  5. Trapezius
  6. Brachiocephalicus
  7. Rhomboideus
  8. Omotransversarius
    (9. Sternocephalicus
  9. Sternohyoideus)
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2
Q

Superficial pectoral

OIAI

A 
O = First 2 sternebrae, usually part of the 3rd; the fibrous raph between adjacent muscles
I = Whole crest of the greater tubercle of the humerus
A = Adduct the limb when not weight bearing or prevent limb being ABducted when weight bearing
I = Cranial pectoral nerves: C7, C8
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3
Q

Deep pectoral muscle

A 
O = Ventral part of sternum 
I = Medial aspect of humerus
A = move trunk cranially and extend the shoulder joint. When non weight bearing to draw limb caudally and flex shoulder joint. To ADDUCT limb
I = Caudal pectoral nerves C8, T1
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4
Q

Brachiocephalicus

A 
O = Cervico-thoracic fascia
I = Distal third of humerus
A = Protractor, shoulder extender, draw neck and head to sides
I = Accessory nerve and ventral branches of cervical
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5
Q

Omotransversarius

A 
O = Transverse wing of atlas (C1)
I = Acromion process
A = LAteral movement, flexion of neck, protractor
I = Accessory nerve
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6
Q

Trapezius

A 
O = Median raphe of neck and the supraspinous ligament from C3 to T9
I =  Spine
A =  Elevate and ABDUCT forelimb
I = Accessory nerve
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7
Q

Rhomboideus

A

Lies under traps
has capital, cervical and thoracic part
O =
Rhomboideus capitis = attaches cranial dorsal border of S to nuchal crest of occipital bone
Rhomboideus Cervicis = median fibrous raphe of neck
Thoracic = spinous process of the first 7 TV
I = medial aspect of dorsal border
A = ABDUCT
I = Ventral branches of cervical and thoracic spinal nerves

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8
Q

Latissimus dorsi

A 
O = Thoracolumbar Fascia covering spinous process T7-L7
I = Teres major tuberosity of humerus + teres major tendon
A = Flex shoudler joint, adduct, RETRACTOR
I = Thoracodorsal nerves C7, C8 T1
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9
Q

Serratus Ventralis

A

Serratus ventralis cervicis and serratus ventralis thoracis
O = Transverse process of last 5 cervical vertebrae and first 7/8 ribs ventral to their middle
I = Faces serrata
A = Support trunk and depress scapula
I = Ventral branches of cervical spinal nerves and the long thoracic nerve C7

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10
Q

Sternocephalicus

A 
O = first sternebrae (manubrium)
I = mastoid part of temporal bone and nuchal crest of ocipital bone
A= move head and neck laterally
I = Accessory nerve and ventral branches of the cervical spinal nerves
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11
Q

What muscles are innovated by the accessory nerve

A

Brachiocephalic, omotransversarius, Trapezius, sternocephalicus

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12
Q

What muscles are innovated by the ventral branches of the cervical spinal nerves

A
  1. Sternocephalicus, Serratus Ventralis, rhomboideus Brachiocephalicus
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13
Q

what muscles insert onto the medial aspect of the humerus?

A

Brachiocephalicus and deep pectoral

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14
Q

What msucle origionates from: Median raphe of neck and the supraspinous ligament from C3 to T9

A

Traps

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15
Q

What muscle inserts onto the spine adn what acromion

A

spine = traps A = omo

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16
Q

which muscels do you ahve a cervical and thoracic part adn what is the origin of these

A
  1. rhom - Cervical = median raphe of neck and first 3 spinous processes of thoracic vertebrae
    Thoracic = spinous process of the first 7 TV
  2. Serratus Ventralis = O = Transverse process of last 5 cervical vertebrae and first 7/8 ribs ventral to their middle
17
Q

What msucle has cervical adn thoracicspinal nerve. say sepcifics

A
  1. rhomboideus = Ventral branches of cervical and thoracic spinal nerves
  2. serratus ventralis = Ventral branches of cervical spinal nerves and the long thoracic nerve C7
  3. sternocephalicus = Accessory nerve and ventral branches of the cervical spinal nerves
  4. Brachiocephalic = Accessory nerve and ventral branches of cervical
18
Q

Sternohyoideus

A 
O = manubrium and first costal cartilage
I = basihyoid bone
A = pull tongue and larynx caudally
I = ventral branches of cervical spinal nerves
19
Q

Name limb protractors

A
  • Omotransversarius
  • Brachiocephalicus
  • Thoracic portion of serratus ventralis
20
Q

Name limb retractors

A
  • Deep pectoral.
  • Superficial pectoral.
  • Cranial portion of serratus ventralis.
  • Latissimus dorsi
21
Q

Name shoulder extensors

A
  • Brachiocephalicus.
  • Biceps brachii.
  • Supraspinatus.
22
Q

Name shoulder flexors

A
  • Deltoideus.
  • Teres major.
  • Teres minor.
  • Triceps (long head).
23
Q

Name the limb abductors.

A
  • Trapezius.
  • Rhomboideus.
  • Infraspinatus (shoulder abductor)
24
Q

Name the limb adductors.

A
  • Superficial pectoral.
  • Deep pectoral.
  • Subscapularis.
25
Q

Describe the route of spinal nerves.

A
  • Leave the spinal cord via intervertebral foramen.
  • Paired left and right branches.
  • Dorsal branches supply dorsal structures and ventral branches form the brachial plexus, in the axillary region
26
Q

List the nerves that compose the brachial plexus

A
  • musculocutaneous.
  • axillary.
  • radial.
  • median.
  • ulnar.
  • suprascapularis.
  • subscapularis.
27
Q

Describe the roles of the efferent and afferent fibres that supply the forelimb.

A

Afferent fibres are sensory.

  • Efferent fibres are motor sensation.

First Year Term 1 (35 decks)

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