Exam 2 Flashcards
What is lumbarization?
When S1 (sacral bone) doesn’t fuse with S2, and as a results there are 6 lumbar vertebrates. mobile spine
What is sacralization?
When one of the lumbar vertebrates (L5), fuse to S1 & as a result, there are only 5 lumbar bones. causes a stiff spine
What are lordosis?
A concavity or hollow in the spine. Found in the cervical & lumbar vertebrates.
found posterior to spine
In the cervical spine, it is concave posterior, but convex anteriorly.
BOWS IN
What is Kyphosis?
A convex spine
Convex posteriorly & concave anteriorly.
In the thoracic & sacral, coccygeal segments.
POKES OUT
There is ____ relationship between posture and pain
NO
Body of the vertebrae
The weight bearing surface. Anterior Part
The vertebral arch is
Composed of the pedicles, the laminae, & the projections
The vertebral foramen is
Space created by the body & the vertebral arch
The vertebral canal…
contains spinal cord & its coverings. Created by successive vertebral foramina
Spinous process is…
Extension posterior from the meeting of the lamina
The lamina is…
the junction between the pedicle & the spinous process
The pedicle is…
the junction between the vertebral body & the vertebral arch
The transverse process is…
Lateral projection originating at the junction of the lamina & pedicle
The superior articular process is…
2 superior projections from the superior portion of the lamina which form synovial joint (facet) with vertebra directly above
The inferior articular process is…
2 inferior projection from the inferior portion of the portion of the lamina which form synovial facet joints with the vertebra directly below
The superior vertebral notch is…
Made by the pedicle & the superior articular process
The inferior vertebral notch is…
made by the pedicle & the inferior articular process
The intervertebral foramen is…
space created by superior & inferior vertebral notches
Characteristics of the cervical spine
- Extreme mobility
- Complex series of joints
- Different function of the intervertebral(low bearing structure), and the Zygopophyseal joint (facilitators of movement)
- Vertebral artery
- 7 vertebrae & 8 nerve roots
- Close approximation to the shoulder
Characteristics of the thoracic spine
- Transitional zone between cervical (C) & lumbar (L)
- 2nd least mobile of the spinal region.
- Ribcage & low ratio of intervertebral disk (IVD)
- Anterior- posterior & transverse dimensions are almost equal
- Height of body is slightly higher posteriorly. (contributes to normal kyphosis)
- Each body has paired costal demi-facets. Posteriorally (one superiorly & one inferiorly), except T10, T11, &T12. Have single facets, because the 3 false ribs don’t attach to the IVD
- Pedicles protrude directly posterior
What is the least mobile region of the vertebrae
Pelvic girdle: sacral
What is the rule of threes?
The amount the spinous process projects posteriorly and inferiorly
T1-T3 spinous process projects…
posteriorly at the same level as the vertebral body
T4-T7 spinous process projects…
posteriorly at half a level below the vertebral body.
T7-T9 spinous process projects…
posteriorly at a whole level below the vertebral body. At the same level of the vertebral body of T8-T10
T10 spinous process projects…
a whole level below
T11 spinous process projects…
half a level below
T12 spinous process projects…
at the same level
Characteristics of the lumbar spine
- Heavy bodies for weight bearing
- Stout transverse processes
- 3/4 of superior and inferior surface of body covered by cartilage end-plate
Characteristics of the sacrum
- 5 fused vertebrae
- Base: superior facets of S1 articulates with inferior facet of L5
- 4 sacral foramina, translate nerves S1-S4 (anterior-sacral foramina)
- Apex of the sacrum is below & base is above (same for the coccyx)
The IVD (cartilaginous joint) connects the
the vertebras of the spine.
The intervetebral joint includes
Symphyses and IVD
The degeneration of ____ is a natural consequence of aging(wrinkles on the inside)
IVD
What are the 2 parts of the IVD?
Annulus fibrosus and Nucleus pulposes
The annulus fibrosus is the ___ of the IVD
outer
Characteristics of the annulus fibrosus
- Runs criss-cross to each other (one inferiorly to the left and other to the right)
- Outer fibers are pain sensitive
- No blood supply, depends on nutrients imbibed by the nucleus pulposes during movement anchoring mechanism with the end plate.
- The rings are designed to maintain outward pressure.
The nucleus pulposes is the ___ of the IVD
inner central piece
Characteristics of the nucleus pulposes
- Hydrophyllic
- Gelatinous micro protein & collagen mix
- Conforms to pressure
- Maintains hydration by getting nourishment from the vertebral bodies above & below
- Has no circulatory blood
- Situated more posteriorly L-spine
What type of joints are zygopophyseal joints? (facets)
Synovial joints
What are the functions of the zygopophyseal joint?
- To protect the IVD in the spine
- To do more to allow movement in the C-spine
- Allows flexion, but also stops flexion to decrease shear on the IVD
What are the medial supporting structures of the zygopophyseal joint?
Ligamentum Fluvum: intramedially
Multifudus: posterio-medially
Characteristics of the Anterior Longitudinal ligament (ALL)
- comes from the atlanto-occipital membrane to the sacrum
- Strong & broad ligament that is supplied by nociceptive (pain) nerve endings
- Considered a stabilizer
- Anterior & lateral connections is bound to the rim vertebral body & blends in with the IVD & spreads to connect posteriorly to the PLL
- Thick where the IVD is and thin where the vertebral body is
- loosely attached to the vertebral body so blood vessels can pass to get to and from the vertebral body
Which ligament is the only one that limits extension
ALL
Characteristics of the posterior longitudinal ligament (PLL)
- Runs from the foramen magnum to the sacrum
- Anterior: to the neural sac (duramater)
- Posterior: to the vertebral body & IVD
- Narrower and weaker than the ALL (doesn’t get stretched very much)
- thinnest part in the L-spine
- attached laterally to the ALL
- well supplied by nociceptive nerve ending
- attached to the IVD, a bit to the rim of the VB, but not so much to the body of the VB to allow for blood vessel movement
Function of the PLL
Prevents disc moving into the dura, because its broader behind the disc than behind the VB
Characteristics of ligamentum flavum
- attaches from the lamina of each vertebral level
- broad pale yellow ban of elastic tissue (elastic fibers) Loses elastin fibers with age
- Segmental: goes from lamina above to lamina below, blending together in the midline
- reinforces the medial capsule of anterior portion of the ZPJ
- No nerve supply
- increases in thickness with age as a result of loss of elasticity
- accumulates fatty deposits in the area
Characteristic of the interspinous ligament
- Thin & membranous
- resist separation of spinous processes (flexion)
- segmental: fibers attached to ligamentum flavum & fan horizontally to blend with supraspinous ligament
- no nociceptive nerve endings
Characteristics of the supraspinous ligament
- cord-like & connects tips of spinous processes, but also attaches & blends in with the interspinous ligament
- comes from C7 to the sacrum & merges superiorly with ligamentum nuchae
Characteristics of the intertransverse ligaments
- consist of adjacent transverse processes
- consist of scattered fibers in cervical region
- round- fibrous cords in thoracic region
- thin & membranous in lumbar region
What is the IST(interspinous, supraspinous, thoracolumbar) complex?
the attachment of the thoracolumbar fascia to the supraspinous ligament in the lumbar spine
What are the superficial muscles of the back?
Trapezius, latissimus dorsi, levator scapulae, rhomboid major, & rhomboid minor
what are the two posterior intermediate muscles?
Serratus posterior superior & serratus posterior inferior
the deep back muscles includes the ____ which has 3 parts. What is its origin and nerve supply?
Erector spina
Origin: broad tendon that attaches to the iliac crest, sacrum, sacroiliac ligaments, and sacral and inferior lumbar spinous processes
Nerve supply: dorsal primary rami
What are the three parts of the erector spina?
- Iliocostalis group (most lateral)
- Longissimus group (intermediate)
- Spinalis group (most medial)
Superficial to the erector spina is the _____ muscle & is supplied by the _____
Sternocleidomastoid
Spinal accessory nerve
The splenius muscle group (superficial layer of the deep back muscles) consist of?
Splenius capitus & spenius cervicis
The splenius group runs ____
Superiorly and laterally from the spinous process
The semispinalis capitus runs from ____ and its fibers run____
cervical spine
fibers are running superiorly & medially
What are the iliocostalis group regions?
Cervicis: cervical region. arises from the 6 upper ribs and attaches to the transverse processes of the lower cervical vertebrae 4-6
Thoracis: thoracic region. Arises from the six lower ribs and attaches to the 6 upper ribs
Lumborum: lumbar region. iliac crest and attaches into the angles of the inferior 6 ribs
What are the longissimus group region?
Capitis: attaches to the head. arises from lower 4 cervical vertebrae and attach to the mastoid process of the temporal bone
Cervicis: attaches to the cervical region. arises from transverse processes of T1-4 or 6 and attaches to transverse processes of C2-6
Thoracis: attaches to the thoracic region. arises from the lower lumbar spinous processes and sacrum and attaches to the lower nine ribs & associated transverse processes
What is a transversospinalis group? (deep layer of intrinsic muscles)
short muscles in grooves between transverse & spinous processes of the vertebrae.
Run from the transverse processes to the spinous processes of the vertebrae
In thoracic spine, rotatores (deepest muscles) & levatores costorum are said to
lift the ribs
The ______ innervate all the muscles that between the angles of the ribs
Posterior primary rami
Posterior to the quadratus lumborum is the middle layer of the _____
thoracolumbar fascia
The anterior layer of the thoracolumbar fascia goes _____ of the QL
infront
The _____ & _______ is found along the entire section of the vertebral column. This is easiest to observe in the thoracic region
rotatores brevis & rotatores longus
The rotatores brevis expands _____ levels
One
The rotatores longus expands ___ levels
two
The posterior (superficial) layer of the thoracolumbar fascia joins together with the _____ & encase the _____
anterior (middle) layer
erector spina group
The ____ is where the posterior & anterior layers join together
lateral raphae
All abdominal muscle attach to the ____, but the ____ has the most direct attachment & the muscle fibers run horizontally, so it has a stronger line of pull on the LR
lateral raphae
transverse abdominus
If all the abdominal muscles pull on the LR, that will singe down and squeeze the layers of the ____, which causes the muscles of the _____ to contract & push out against the 2 layers & help produce an ______
Thoracolumbar fascia
Erector spina group
hydrolic amplifier effect
The anterior layer of the thoracolumbar fascia surrounds the _____
quadratum lumborum
Each vertebra is supplied by ____ & ____ of the major cervical & segmental arteries & their spinal branches
periosteal & equatorial
Periosteal nutrient branches supply the _____
transverse spinous processes in the bone
Equatorial branches come from the ______ supply the ____
lumbar arteries
the vertebral body
Spinal branch of lumbar artery goes into the ____ & forms the nutrient arteries that supply the _____
Intervertebral foramen
back of the body
Parent arteries of ______, _____ & _____ occur at all levels of vertebral column
periosteal, equatorial, & spinal branches
Spinal veins form venous plexuses both ___ & ___ vertebral column
inside & outside
Which veins are in between venous plexus & come anteriorly into the VB. They have to get past the ALL & PLL, which is why they are loose behind the the VB
Basivertebral veins
What is the major reflex center & conduction pathway between the body and the brain?
Spinal cord
What protects the spinal cord?
The vertebrae, and its associated ligaments & muscles, spinal meninges (duramater, arachnoid mater, & pia mater) & the cerebrospinal fluid (CSF)
The spinal cord moves with the ____
head, neck, trunk movements
The spinal cord is continuous with the..
medulla oblangata of the brain stem
The spinal cord ends at level of ___ & ___, in a bunt structure called the ____
L1 & L2. Called the conus medullaris
In embryos, the spinal cord…
- Occupies full length of the vertebral column
- Segments lie approx. at the vertebral level of the same number
- Spinal nerves exit laterally through corresponding IV foramen
In the fetal period, the spinal cord
- The vertebral column grows faster than the cord
- Ascends relative to the vertebral canal
At birth, the spinal cord
- tips of the conus medullaris is at the L4-5 level
- cord is shorter than vertebral canal, so spinal nerves exit obliquely (go out downwards and laterally)
In adults, the spinal cord
- ends at L1-2 level (the normal level). (Range is T12-L3)
- loose bundle of lumbar & sacral spinal nerves (descending nerve roots), called the caudal equina
What is a lumbar cistern?
An enlargement of the subarachnoid space between the conus medullaris of the spinal cord & inferior end of subarachnoid space & the dura mater
Where does the cauda equina sit?
in the lumbar cistern
Where is the multifudus found?
found from C2-S4 vertebrae. Most prominent in the lumbar region
Where are the rotatores found?
Along the entire length of the vertebral column. Easiest to observe in the thoracic region
What are the two enlargements of the spinal cord?
cervical and lumbar
how many pairs of spinal nerves are there?
31
First cervical nerve exits between____ and ____
skull and atlas
Cervical nerves exit _____
above their proper vertebrae
The 8th cervical spine exits between the ____ & __. Why?
C7 & T1.
Because there are 8 cervical spinal nerves & 7 cervical vertebrae, so a change occurs at C7, T1.
Dorsal roots carry _____; cell bodies are located in the _____. The ganglion is located in the _____
Sensory information
In the dorsal root ganglion
Intervertebral foramen
Ventral roots carry ___. Cell bodies are located in the _____
Motor information
Gray matter of the spinal cord
Roots come together and form nerves as they exit the ___
intervertebral foramen
The nerves immediately split into _____ & ______
Ventral primary rami & dorsal primary rami
Ventral primary rami travel ___ providing ____ and ____ innervation
Anteriorly
Motor and sensory
Dorsal primary rami travel toward the ____ to provide innervation to the structures in the back
back