Trunk Flashcards
What is the axial skeleton?
the intermediary between the upper and lower extremity
What does the axial Skelton consists of? (4)
Head
vertebral column
sternum
ribs
What are the functions of the vertebral column?
- provide support and stability to the HAT
- shock absorption
- dispersion of weight
- attachement site for neck and trunk muscles
- protects the spinal cord
What does the anterior portion of the spinal cord do?
weight bearing and increased mobility
What does the posterior portion of the spinal cord do?
protects the spinal cord, limits motion, elongated processes increase muscle leverage
Name the parts of the vertebrae
7 cervical
12 thoracic
5 lumbar
What is the sacro-coccygeal?
sacrum: 5 fused vertebrae
coccyx- 4 fused vertebrae
Name the curves of the vertebral column.
cervical- concave (hunchback, lordosis)
thoracic- convex
lumbar- concave
sacral- convex
The curve of the spine is originally what?
convex posteriorly at birth aka kyphotic
What is the primary vertebral curve?
kypotic, convex
What are the 3 degrees of motion in most vertebral joints?
Flexion/extenion - sagittal plane
Lateral flexion (L&R)- frontal plane
Rotation (R&L)- transverse
What is the spinous process?
an attachement site for soft tissues aka ligaments and tendons; serve as lever arms for spinal motion
What is the shape of the spinous process?
shape of spinous process varies from spinal region
What is the transverse process?
typically projects laterally off to each side, attachment site; work as lever arms
Name the structures of the vertebrae
- vertebral body
- vertebral foramen
- pedicle
- lamina
Describe:
- vertebral body
- vertebral foramen
- pedicle
- lamina
- vertebral body: weight bearing structure
- vertebral foramen: provides channel for the spinal cord to pass
- pedicle- bony arm connecting the body of the vertebrae to each transverse process
- lamina-body arch connecting spinous processes to transverse processes
What forms the anterior vertebral structures
vertebrae
intervertebral discs
longitudinal ligaments
What are the 3 functions of the anterior vertebral structures?
Protects facet joints
from compression injury
Permit and limits motions of the vertebrae
What are the vertebral disc composed of?
annulus fibrosis
nucleaus pulposus
verterbral end plates
Describe:
annulus fibrosis
nucleaus pulposus
verterbral end plates
annulus fibrosis- cartilaginois rings that enclose the nucleus pulposus
nucleaus pulposus- gel with 80% water content
verterbral end plates- two hyaline cartilaginous plates
What does increased load cause?
causes increased force to the anterior, posterior, and lateral parts of the vertebral body which limits vertebral compression
What happens with extensive walking and standing during the day?
causes the nucleus to lose small quantities of water
What happens to our height throughout the day?
compression forces actually diminish height throughout the day
What do the longitudinal ligaments do?
the Anterior longitudinal ligaments and posterior longitudinal ligaments cover the front and back of the vertebral bodies from the axis to the sacrum
What does the ALL specifically do?
What does the PLL specifically do?
ALL limits backward bending
PLL restrains forward flexion
Name the 5 parts of the vertebral joint elements.
- Arches
- Transverse and spinous processes
- Bilateral facet joints
- Joint capsules
- Ligaments
What is the function of a facet joint?
-Function of facet joints: control vertebral motions/protect disc