Gross Anatomy 2 - Back, vertebral column, spinal cord Flashcards
What are the 2 main functions of the back?
Maintenance of posture
Movements of limbs and trunk
What anatomical structure does the skin dimples of the lower back indicate?
Posterior superior iliac spines (PSIS)
Were do the extrinsic back muscles attach to?
Pectoral girdle
What is the function of the extrinsic back muscles?
Move upper limb
Name the 4 extrinsic back muscles?
Levator scapulae
Rhomboids
Trapezius
Latissimus dorsi
What is the function of the intrinsic back muscles? (2)
Maintain back posture
Move spine
What is the name for the superficial intrinsic back muscles?
Erector spinae
What is the name for the deep intrinsic back muscles?
Transversospinalis
Where do the erector spinae muscles attach inferiorly?
Common tendon attaches to the sacrum and iliac crest
Where do the erector spinae muscles attach superiorly?
A rib A transverse process of a vertebrae or A spinous process of a vertebrae Via tendon
Where is transversospinalis located?
Within the grooves between the transverse and spinous processes
What is the nerve supply to the intrinsic back muscles?
Posterior rami branches (cervical, throacic, lumbar) as per the myotome pattern
Contraction of what muscle bilaterally causes extension of the spine?
Erector spinae
Contraction of what muscle unilaterally causes lateral flexion of the spine?
Erector spinae
Contraction of what 2 muscles causes flexion of the spine?
Psoas major
Rectus abdominis
Where does natural lordosis of the spine occur?
what are these areas all referred to as?
Cervical and lumbar regions
Secondary curves of the spine
Where does natural kyphosis of the spine occur?
What are these areas also referred to as?
Thoracic and sacral spine
Primary curvatures of the spine
What is the name of the joint between inferior and superior articular processes of the spine?
Synovial facet joints
What are the 2 components of the vertebral arch of a vertebra?
Pedicle (X2)
Lamina (X2)
What is unique about the C1-C2 joint?
It has no intervertebral disc
Name of the outer ring of the intervertebral disc?
Outer fibrous ring/ annulus fibrosus
Name of the inner soft pulp of the intervertebral disc?
Nucleus pulposus
Name of the short ligaments which connect adjacent laminae posterior to the spinal cord?
Ligamentum flavum
Name for the narrow, weak ligaments which prevents over-flexion of the spine?
Posterior longitudinal ligament
Name for the broad, strong ligament which prevents over-extension of the spine?
Anterior longitudinal ligament
Name for the ligament that connects the tips of the spinous processes?
Supraspinous ligament
Name for the weak, membranous ligament that connects superior and inferior surfaces of adjacent spinous processes?
Interspinous ligament
Name of C1 vertebrae?
Atlas
How does atlas vary from other vertebrae?
no body or spinous process (posterior and anterior arch instead)
Name of C2 vertebrae?
Axis
How does atlas vary from other vertebrae?
Has an odontoid process
What is the name of the first palpable spinous process in approx. 70% of people?
C7 i.e. vertebrae prominens
What is the name for the joint between the occipital condyles and the superior articular facets of the atlas?
Atlanto-occipital joints
What type of joint is the atlanto-occipital joint?
Synovial
Movements enabled by the atlanto-occipital joints?
Flexion and extension of the neck
A little lateral flexion and rotation
How many articulations does the atlanto-axial joint have?
3
What are the 3 joints of the atlanto-axial joint between?
2 between inferior articular facets of the atlas and the superior articular facets of the axis
1 between the anterior arch of the atlas and odontoid process of the axis
What type of joint is the atlanto-axial joints?
Synovial
Main movement of the atlanto-axial joints?
Rotation
What is the name of the inferior opening of the sacral canal?
Sacral hiatus
Name of the top left part of the sacrum?
Left ala
Where is cadaul anaesthesia injected?
What is the purpose of this?
into the sacral hiatus to anaesthetise the sacral spinal nerve roots of the cauda equina
At what vertebral level does the spinal cord end?
L1/L2
Name for the spinal nerves that continue down the spinal canal after the spinal cord has terminated?
Cauda equina
What lies between the vertebrae and dura mater in the spinal canal?
Epidural fat
What is the name for the removal of one or more spinous processes and the adjacent lamina?
Laminectomy