Test 3- Anatomy 1- Spinal Cord Flashcards
External Cord Anatomy
- The spinal cord begins as a continuation of the _______ (the most inferior portion of the brain stem) extending from the foramen magnum of the occipital bone to its termination as the _______ between L1-L2
- Medulla Oblongata/Conus Medullaris
Meninges
- The spinal meninges surround the _______ and are continuous with the _______, which encircle the _____
- The three meninges, from outermost inward are: _____, _____, ____
- Spinal cord/Cranial meninges/Brain
2. Dura mater/Arachnoid mater/Pia mater
Dura Mater
- The most _____ of the three spinal meninges
- Forms a sac from the level of the _______ to the second ______ vertebra
- ________: between the dura mater and the wall of the vertebral canal contains a cushion of fat and connective tissue further cushioning the spinal cord
- Superficial
- Foramen magnum/Sacral Vertebra
- Epidural space
Arachnoid mater
- Arachnoid is continuous with the arachnoid mater of the _____
- Between the dura mater and the arachnoid mater is the thin ______ which contains interstitial fluid
- Brain
2. Subdural space
Pia mater
- Contains blood vessels that supply _____ and ______ to the spinal cord
- Is a thin _______ connective tissue layer that adheres to the surface of the ______ and _____
- Between the arachnoid mater and the Pia mater is a space filled with cerebrospinal fluid called the _______
- Oxygen/Nutrients
- Transparent/Spinal cord/Brain
- Subarachnoid space
Denticulate ligaments
- Membranous, thickened extensions of the ______ that project laterally and fuse with ______ and inner surface of ______
- Suspend the spinal cord within its _____, protecting it against sudden displacement
- Pia mater//Arachnoid mater/Dura mater
2. Dura sheath
Arachnoid trabeculae
- Delicate strands of tissue emanating from the _______
- Span the subarachnoid space, connecting the ______ and the _____
- Arachnoid mater
2. Arachnoid/Pia
Spinal Cord external anatomy
- In adults the spinal cord extends from the ______ (the inferior part of the brain) to the superior border of the ________
- The ______ enlargement and _______ enlargement accommodate nerves to and from the upper and lower limbs, respectively
- Medulla oblongata/Second lumbar vertebra
2. Cervical/Lumbar
Spinal cord external anatomy
- Inferior to the lumbar enlargement the spinal cord tapers to a conical shaped portion termed the _______, which in adults ends at the level of the IV disc between vertebra L1 and L2
- The _____: is an extension of the Pia mater that arises of the Pia mater that arises from the conus medullaris to anchor the spinal cord to the coccyx
- Conus medullaris
2. Film terminale
Spinal cord external anatomy
- Nerves that arise from the inferior part of the spinal cord do not immediately leave the vertebral column but rather continue in the vertebral canal in fine strands collectively termed the ________ (horses tail)
- Cauda equina
Spinal Nerves
- Spinal nerves are the paths of ______ between the spinal cord and nerves innervating specific regions of the body
Two bundles of axons connect each spinal nerve to a segment of the cord.
- Each bundle is called a _____, which in turn is composed of smaller bundles of axons called _____
- The roots are: ____, _____
- Communication
- Root/Rootlets
- The posterior (or dorsal) root/The anterior (or Ventral) root
External Cord Anatomy
- Each posterior root has a swelling, the _______, which contain the cell bodies of sensory neurons
- The _______ contain axons of ____ neurons, which conduct nerve impulses from the CNS to effectors (muscles and glands)
- Posterior (dorsal) root ganglion
2. Anterior (ventral) root and rootlets/motor
Overall internal anatomy
- The gray matter of the spinal cord is shaped like the letter ___, or a butterfly, and is surrounded by ______
- The gray commissure forms the crossbar of the ____
- H/White matter
2. H
Overall functional aspects of spinal cord gray matter
- Gray matter receives and integrates _____ and _______ information
- Incoming/Outgoing
Polio
- Poliomyelitis is caused by the ______
- Onset is marked by ____, severe ______, stiff _____ and _____, deep muscle ____ and _____
- The Virus produces damage and paralysis by destroying ______ of ______ neurons in the _____ of the spinal cord and in nuclei of cranial nerves
- Poliovirus
- Fever/headache/neck/back/pain/weakness
- Cell bodies/motor/Anterior Horn
Regions of white matter
The anterior and posterior gray horns divide the white matter inot three broad areas called columns:
- ______
- _____
- _____
- Anterior (ventral) white columns
- Posterior (dorsal) white columns
- Lateral white columns
Tracts in the spinal cord
- Bundles of myelinated axons Called ______, have a common origin or destination and carry similar information up or down the spinal cord
- ______ tracts comprise axons that conduct nerve impulses toward the brain
- ________ tracts carry nerve impulses down the spinal cord
- Tracts
- Sensory (ascending)
- Motor (descending)
Spinal cord tracts and information processing
- ______ tracts ascend to or descend from the brain
- ______ process information input and out put
- White matter
2. Gray matter
Spinal nerves
- Spinal nerves and the nerves that branch from them are part of the ______ nervous system
- They connect the _______ nervous system to _____, _____, and ______ in all parts of the body
- There are ____ pairs of spinal nerves
- Peripheral
- Central/sensory receptors/muscles/glands
- 31
Naming spinal nerves
- Spinal nerves are named and numbered according to the _____ and _____ of the vertebral column from which they emerge
- The first ______ pair emerges between the ____ bone and the ____
- All other spinal nerves emerge through _________ between ______ vertebrae
- Region/Level
- Cervical/Occipital/Atlas
- Intervertebral Foramina/Adjoining
Naming Spinal nerves
Nerves are named in sequence:
- ____ pairs: of _____ nerves are named C1-C8
- ____ pairs of ______ nerves T1-T12
- ____ pairs of ______ nerves named L1-L5
- ____ pairs of _____ nerves named S1-S5
- _____ Pair of _____ nerves named Co1
- Most spinal nerves exit _____ to the vertebra of the same number, the exception being cervical nerves due to the fact that C1 exits ______ to the atlas (which is the cervical vertebra)
- 8/Cervical
- 12/Thoracic
- 5/Lumbar
- 5/Sacral
- 1/Coccygeal
- Inferior/Superior
Spinal nerve names correlate with exits from vertebral column
- Spinal nerves do not necessarily exit the spinal cord in the same _____ as their corresponding ______
- Pane/Vertebrae
Spinal nerve names correlate with exit from vertebral column
- During early childhood both the _____ and ______ grow longer as part of overall growth
- Spinal elongation stops about age ____ or ____ years, But ______ growth continues
- Spinal cord/Vertebral column
2. 4/5/Vertebral column
Spinal nerve names correlate with exit from vertebral column
- The consequence is the ______ offset, and the fact that in adults, the spinal cord does not extend the entire length of the ______
- The resulting _______ comprises roots of the lower lumbar, sacral, and coccygeal nerves
- Observed/ Vertebral column
2. Cauda equina
Structure of Spinal nerves
- Server all rootlets emerge from the _____ and _____ surfaces of the spinal cord
- The rootlets coverage to form the _____ and ______ of the spinal nerves
- The dorsal and ventral nerve roots unite at their points of exit from the vertebral canal to form a _____ nerve
- Each spinal nerve divides almost immediately into a _______ and a ______
- Dorsal/Ventral
- Dorsal/Ventral roots
- Spinal nerve
- Dorsal primary Ramus/Ventral primary ramus
Connective tissue coverings
- Individual axons are covered by an ______
- Groups of axons comprise a _____
- Each fasciae is wrapped in ______
- The entire nerve is covered by an ______
- Endoneurium
- Fascicle
- Perineurium
- Epineurium
Branches of Spinal nerves
- Each nerves divides into several branches just after passing through its _______ foramen
- Each branch is a _____
- ______ are the terminal branches of spinal nerves
- Intervertebral
- Ramus
- Rami
Rami
- _____ Innervates deep muscles and skin of the dorsal surface of the trunk
- _____ serves muscles and structures of the upper and lower limbs and the skin of the lateral and ventral surfaces of the trunk
- Posterior (dorsal) ramus
2. Anterior (ventral) ramus
Rami
- The ______ of each spinal nerve reenters the vertebral canal to supply the vertebrae and associated structures
- Other branches form the ________ and contributes to the trunk ganglia of the autonomic nervous system
- Meningeal branch
2. Rami Communicantes