Myology 1.2. neck and trunk Flashcards
cutaneous muscle of the trunk
musculus cutaneus trunci
covers lateral part of trunk caudal to shoulder and arm;
fibres running in a caudodorsal direction;
attached to dermis and is involved in the panniculus reflex
platysma
same in latin
in carnivores and pigs,
well-developed muscular sheet, radiates from the lower facial cutaneous muscle to clavicle area.
well-developed in carnivores and pigs, tenses and moves skin on dorsal and lateral side of neck
cervical cutaneous muscle
m. cutaneus colli: on the ventral aspect of the neck in Un
‘Muscles of the neck’ in latin
mm. colli
Name 3 main groups for the muscles of the neck (english)
dorsal, lateral, ventral groups
in which dorsi has superficial and deep muscle groups
Name 5 main muscles of the dorsal neck in latin
m. longus capitis
m. obliquus capitis cranialis
m. obliquus capitis caudalis
m. rectus capitis dorsalis major
m. rectus capitis dorsalis minor
Major dorsal straight muscle of the head
m. rectus capitis dorsalis major
In (eq and ru) lie lateral to nuchal ligament.
O: Spinous process of the axis
I: Nuchal crest of os occipitale
F: extends the atlanto-occipital joint
Minor dorsal straight muscle of the head
m. rectus capitis dorsalis minor
deep to the long muscle of head, extends between the occiput and atlas
O: Dorsally on atlas
I: Dorsally on magnum foramen
F: Extends the atlanto-occipital joint
Cranial oblique muscle of the head
m. obliquus capitis cranialis
Short muscle extending obliquely craniolaterally over
atlanto-occipital joint, covered by splenius and parts of brachiocephalic muscle.
O: Wings of atlas
I: Nuchal crest
F: Extends and draws head to the side when contracting unilaterally
Caudal oblique muscle of the head
m. obliquus capitis caudalis
Covers the atlas and axis dorsally. Originates from
spinous process of axis, passes obliquely craniolaterally to its insertion on wing of atlas.
O: Spinous process of axis
I: Wings of atlas
F: Rotates the head and fixes the atlanto-occipital joint
Long muscle of the head
m. longus capitis
Lies on lateral and ventral sides of C2-6.
O: Transverse processes of C2- 6
I: Base of the skull
F: Flexes atlanto-occipital joint and draws head and cranial parts of the neck to the side.
Name 6 main muscles of the lateral neck in latin
m. splenius: capitis et cervicis
m. brachiocephalicus
m. sternocephalicus
m. omotransversarius
m. longus colli
mm. scaleni (m. scalenus: ventralis, medius et dorsalis )
Splenius muscle
m. splenius: cervicis et capitis
O: Spinocostotransverse fascia, nuchal ligament, spinous processes of the thoracic vertebrae
I: cervicis: Transverse processes of 3rd to 5th cv
I: capitis: Occipital bone, mastoid process (eq)
F: Extends and draws head and neck to the side
Brachiocephalic muscle
m. brachiocephalicus
O: Clavicular tendon and the distal end of the cranial surface of the humerus.
I: Dorsal surface of the neck.
F: Bilateral fixation of the neck.
Omotransverse muscle
m. omotransversarius
O: Wing of atlas or transverse process of 2nd cervical vertebra
I: Distal end of spine of scapula
F: Draws neck downward and sidewards; draws scapula forward
Sternocephalic muscle
m. sternocephalicus
(in ru: sternomandibular and sternomastoid muscles)
(in eq: only sternocephalicus -> sternomandibular)
O: manubrium sterni
I: depending on specie/muscle: Mastoid part of the temporal bone and to the dorsal nuchal line of the occipital bone or mandible.
F: To draw the head and neck to one side.
Long muscle of the neck
m. longus colli
O: 5th to 6th thor.vert.
I: 1st cervical vertebra
F: Flexes the neck
Scalene muscles
mm. scaleni
(m. scalenus: ventralis, medius et dorsalis)
dorsalis absent in eq
→ventralis:
O: 1st rib
I: 7th cervical vertebra
F: Same for all, fixes the neck, draws neck downwards and bends it side-ways; supports inspiration
→medius
O: 1st rib
I: Transverse processes of the 7th-3rd cerv.vert.
→dorsalis: absent in (eq). Originates from 4th or 5th rib in ruminants. With two heads from 3rd to 5th or from 9th to 8 ribs in carnivores.
O: 3rd to 8th ribs
I: Transverse processes of 6th to 3rd cerv.vert.
Name 3 main muscles of the ventral neck in latin
m. sternohyoideus
m. sternothyreoideus
m. omohyoideus
Sternohyoid muscle
m. sternohyoideus
O: manubrium and the cranial edge of the first costal cartilage.
I: Basihyoid bone/ basihyoideum
F: Pulls the basihyoid bone and tongue caudally.
Sternothyroid muscle
m. sternothyreoideus
O: on sternohyoideus
I: thyroid cartilage
F: pulls hyoid and larynx
Omohyoid muscle
m. omohyoideus
Most developed in (eq).
O: subscapular fascia close to shoulder joint in (eq) and from deep fascia of neck in ru
I: basihyoid bone.
F: retracts hyoid bone
mm. dorsi are further divided into what 2 groups
superficial and deep muscle groups
Name mm. dorsi 3 superficial muscles
m. trapezius (pars: cervicalis et thoracica)
m. rhomboideus (capitis, cervicis et thoracis)
m. latissimus dorsi
Trapezius muscle and parts
m. trapezius pars: cervicalis et thoracica
O: Nuchal ligament, supraspinous
ligament.
Widthwise = o. varies according to the species but middle of the nuchal ligament to mid thor.vert.
I: Spine of the scapula.
F: Elevation of the limb and draws it forward. (protraction)
Rhomboid muscle
m. rhomboideus (capitis(only in car), cervicis et thoracis)
O: Nuchal ligament from 2nd–6th cerv.vert. to the 7th thor. vertebra
I: Medial surface of the base of scapula and scapular cartilage
F: Draws limb forward and fixes scapula against the trunk;
Broadest muscle of the back
m. latissimus dorsi
O: thoracolumbar fascia and spinous processes of the lumbar vertebrae and last 7/8 thoracic vertebrae
I: tuberositas teres major
F: Draws limb backward; antagonist to the brachiocephalic muscle
Name mm. dorsi deep layer’s 11 muscles
serratus ventralis cervicis et thoracis longissimus semispinalis spinalis mm. interspinale mm. intertransversarii, iliocostalis quadratus lumborum psoas minor iliopsoas: psoas major and iliacus
Iliocostal muscle and its 3 divisions
m. iliocostalis: cervicis, thoracis et lumborum
O: Crista iliaca, transverse processes of L.V. and the fascial sheet which separates the iliocostal muscles from the longissimus.
I: transverse processes
A: Bends the vertebral column sideways
Longissimus muscle and its 5 divisions
m. longissimus: atlantis et capitis, cervicis, thoracis, lumborum
- atlantis et capitis (are sorta parallel with atlantis ventral to capitis)
O: Transverse processes of T1 and C7
I: Wing of atlas, mastoid part of the temporal bone
F: Raises and bends head sideways, turns the head
-cervicis
O: Transverse processes of the T8-5
I: Transverse processes of the C7-3
F: Raises and bends the neck laterally
Both lumb and thor:
O: Spinous processes of sacral, lumbar and thoracic vertebrae; ilium
I: Articular, mammillary and transverse processes of thoracic column and proximal on ribs
F: Fixes and extends the vertebral column, raises cranial part of the body
Spinal muscle
m. spinalis: thoracis et cervicis
find a direct continuation to the neck and head
in the semispinal muscle of the head.
su and eq
O: Extending across the spinous processes of one or more vertebrae
I: Extending across the spinous processes of one or more vertebrae
F: Fixes the back and neck
car and ru
O: Spinous processes, mammillary and transverse processes of the first lumbar and last thoracic vertebra
I: Spinous processes of the 1st–6th thoracic and 6th/7th cervical
vertebrae
F: Fixes and extends the back, levator of the neck, unilaterally:
bends back and neck sideways
Semispinal muscle
m. semispinalis capitis, cervicis et thoracis
capitis:
O: Spinocostotransverse fascia, transverse processes of the first
5-8 thoracic vertebrae, articular processes of C2-7
I: Occipital squama
F: Raises and bends head sideways
semispinalis cervicis:
fuses with m. spinalis in ru and is absent in eq
semispinalis thoracis:
lies laterally on top of m. spinalis
O: mammillary processes
I: spinous processes
dorsal muscles (this is a muscle group)
mm. dorsi