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Lecture 5

APA 1313 Lecture Notes - Lecture 5: Splenius Capitis Muscle, Splenius Cervicis Muscle, Splenius Muscles


Department
Human Kinetics
Course Code
APA 1313
Professor
Li Jingxion
Lecture
5

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16/10/16
Muscles Study Notes - 228, 280, 281
anatomy zone.com
Superficial layer: Splenius muscles
Intermediate layer: Erector spine
group(sacrospinalis)
Deep layer: Transversospinal muscle group
Splenius Capitis
Origin: Nuchal ligament and spinous process of C7-
T3 or T4 vertebrae.
Insertion: Mastoid process of temporal bone and
lateral third of superior nuchal line of occipital bone.
Splenius Cervicis
Origin: Nuchal ligament and spinous processes of
C7-T3 or T4 vertebrae.
Insertion: Transverse process of C1-C3 or C4
vertebrae.
***Main action: Acting alone, laterally flex and rotate
head to the side of active muscles; acting together,
extend head and neck.
Erector Spinae Muscles
-Iliocostalis
Origin: Arises from the ilium.
Insertion: Fibres run superiorly to ribs and cervical
transverse processes.
-Longissimus
Origin: Arises from the ilium.
Insertion: Ribs between tubercles and angles, to
transverse processes in thoracic and cervical
regions, and to mastoid process of temporal bone.
-Spinalis
Origin: Arises from the ilium.
Insertion: Spinous processes in the upper thoracic
region and to the skull.
*** Main action: Acting bilaterally, extend vertebral
column and head; unilaterally, laterally flex vertebral
column.
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16/10/16
Transversospinal Muscle Group
- Semispinalis(superficial)
Origin: Transverse processes of C4-T12
vertebrae.
Insertion: Fibres run superomedially to
occipital bone and spinous processes in
thoracic and cervical regions.
Main Action: Extends head and thoracic
and cervical regions of vertebral column
and rotates them contralaterally.
-Multifidus(deeper)
Origin: Posterior aspects of sacrum and
ilium, transverse processes of thoracic
and lumber vertebrae, and articular
processes of the C4-C7.
Insertion: Fibres pass superomedially to
entire length of spinous processes of
vertebrae above.
Main Action: Stabilizes vertebrae during
local movements of vertebral column;
unilateral contraction rotates to contralateral side.
-Rotatores(deepest)
Origin: Transverse processes of vertebrae.
Insertion: Pass superomedially to attach to root of
spinous processes of the next one or two vertebrae
superiorly.
Main Action: Proprioception organs; stabilize vertebrae
and assists with local extension and rotary movements
of vertebral column.
Minor Deep Layer Muscles
-Interspinal Muscles
Connect spinous processes; aid in extension and
rotation.
-Intertransverse Muscles
Connect transverse processes; aid in lateral flexion,
and stabilize vertebral column when acting bilaterally.
-Levatores Costarum
Elevates ribs, assisting inspiration and laterally flexion
of vertebral column.
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