A9 - Mm. cingulorum membri thoracici et pelvini Flashcards Preview

Anatomy 3 oral > A9 - Mm. cingulorum membri thoracici et pelvini > Flashcards

Flashcards in A9 - Mm. cingulorum membri thoracici et pelvini Deck (17)
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1
Q

Give the muscles of the pectoral girdle

A

Superficial layer:

  • M. trapezius
    • ​Pars cervicalis
    • Pars thoracica
  • M. sternocleidomastoideus
    • ​M. sternocephalicus
    • M. brachiocephalicus
  • M. omotransversarius
  • M. latissimus dorsi
  • Mm. pectoralis superficialis
    • ​M. pectoralis descendens
    • M. pectoralis transversus

Deep layer:

  • M. pectoralis profundus
  • M. subclavius (ø ca)
  • M. rhomboideus
    • ​Pars capitis (ca, su)
    • Pars cervicis
    • Pars thoracis
  • M. serratus ventralis
    • ​Pars cervicis
    • Pars thoracis
2
Q

M. trapezius

A
  • Divided into:
    1. Pars cervicalis
    2. Pars thoracica
  • Origin: C3 → Th9 region
    • Pars cervicalis: From raphe of neck
    • Pars thoracica: from supraspinous ligament
  • Insertion: Spina scapula
    • Pars cervicalis: proximal 3/4 of spina scapula
    • Pars thoracica: proximal thrid of spina scapula
  • Action:
    • Elevate (lift) and abduct the forelimb
    • Stabilize the shoulders
3
Q

Give the division of m. sternocleidomastoideus

A
4
Q

M. sternocephalicus

A
  • Origin: manubrium sterni
  • Insertion:
    • Divided into:
      1. M. sternomastoideus: mastoid part of os temporale
      2. M. sternooccipitalis: c**rista nucha of os occipitale
  • Action: Draw the head and neck to the side
5
Q

M. brachiocephalicus

A

From humerus to head and neck

  • Divided into:
    1. M. cleidobrachialis
      • Origin: Clavicle
      • Insertion: Distal part of christa humeri
    2. M. cleidocephalicus
      1. M. cleidomastoideus
        • Origin: Processus mastoideus of os temporale
        • Insertion: Iscription clavicularis
      2. M. cleidocervicalis
        • Origin: The dorsal midline over the cranial half of the neck
        • Insertion: Inscription clavicularis
  • Action:
    • If forelimb is fixed: unilateral contraction of the muscle moves head into the lateral direction, bilateral contraction fixes head and neck (or bends downward)
    • If limb is free (it’s in an elevated position), it will move forelimb cranially
6
Q

M. omotransversarius

A
  • Origin: Spina scapula on ventral part
  • Insertion: Ala atlantis, caudal border
    • Eq: also C2-4 on processus transversus
  • Action:
    • Advance the limb (draw the shoulder cranially
    • Flex the neck laterally
  • Innervation: N. accessorius (XI)
7
Q

M. latissimus dorsi

A
  • Origin:
    • Superficial layer of thoracolumbar fascia
    • From spinous process of last 7-8 thoracic and lumbar vertebrae
    • Proximally to the last few ribs
  • Insertion: Tuberositas m. teres major (together with m. Teres major)
  • Action:
    • Draws free limb caudally
    • With teres major: Flexes shoulder
  • Innervation: N. thoracodorsalis
8
Q

Mm. pectoralis superficialis

A
  • Origin:
    • M. pectoralis descendens: Manubrium sterni
    • M. pectoralis transversus: From sternebrae 1-3
  • Insertion:
    • Crista tuberculi majoris of humerus
    • Upper part of crista humeri
  • Action:
    • Ventral connection to forelimb
    • Adduction
    • Draws limb cranially or caudally depending its position
  • Innervation: N. pectoralis cranialis
9
Q

M. pectoralis profundus

A
  • Origin:
    • All sternebrae
    • Costal cartilage of true ribs
  • Insertion:
    • Ca: T**uberculum major of humerus
    • Eq: Tuberculum major and tuberculum minor of humerus
    • Sus: Tuberculum minor of humerus
  • Action: Support the trunk, strong retractor and adductor of the forelimb
  • Innervation: N. pectoralis caudalis
10
Q

M. subclavius

A

Ø Car

  • Origin: Manubrium sterni and adjacent parts of the sternum and ribs
  • Insertion:
    • Cranial border of the scapula
    • Clavicle
  • Innervation: N. pectoralis cranialis
11
Q

M. rhomboideus

A
  • Origin:
    • Pars capitis (ca, su): Crista nuca of os occipitale
    • Pars cervicis: From raphe of neck to Th1-3 on processus spinosus
    • Pars thoracis: Processus spinosus of th4-7.
  • Insertion: Dorsomedial border of scapula
  • Action:
    • Elevates limb
    • Pulls base of scapula against trunk forwards or backwards (depending on which part will contract more)
12
Q

M. serratus ventralis

A
  • Divided into:
    1. Pars cervicalis
    2. Pars thoracis
  • Origin:
    • Pars cervicalis: C2-7 on processus transversus
    • _Pars thoraci_s: Middle of rib 1-8
  • Insertion: Facies serrata on scapula (medially)
  • Action:
    • Supports trunk
    • Helps inspiration
    • Carries shoulder cranially or caudally with respect to position of forelimb
  • Innervation: N. thoracicus longus
13
Q

Give the muscles of the pelvic girdle

A
  • M. psoas minor
  • M. iliopsoas
    • ​M. psoas major
    • M. iliacus
  • M. quadratus lumborum
14
Q

M. psoas minor

A
  • Origin: Last few thoracic and first few lumbar vertebrae, on corpus
  • Insertion: Eminentia iliopubica
  • Action:
    • When the vertebral column is fixed: To draw the pelvis into a deeper position
    • When the pelvis is fixed: To stabilize and arch the lumbar and vertebral column dorsally
15
Q

M. psoas major

A
  • Origin: Lumbar vertebrae, on corpus and processus transversus
  • Insertion: Trochanter minor of femur
  • Action: Draw the thigh forewards by flexing the hip and turning the stifle outwards
16
Q

M. iliacus

A
  • Origin: Arising between linea arcurata and lateral border of os iliaca (sacroiliac joint)
  • Insertion: Trochanter minor of femur (medially) between m. Rectus femoris and m. Pectineus (together with M. psoas major)
  • Action: Enforcement of the sacroiliac joint
17
Q

M. quadratus lumborum

A
  • Origin:
    • 11-13 thoracic vertebra ventrally
    • Last two ribs
    • Lumbar vertebra on processus transversus
  • Insertion: medial surface of iliac wing (between articular surface and cranial ventral iliac spine of tuber coxae)
  • Action: fixation and dorsal flexion of vertebral column

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