What are the protective coverings of the spinal cord called?
Click to see answer
Meninges
Click to see question
What are the protective coverings of the spinal cord called?
Meninges
What structure divides the subarachnoid space in the spinal cord?
Subarachnoid Septum
What is the conus medullaris?
The conical lower end of the spinal cord.
What is the name of the enlarged subarachnoid space in the lower lumbar region?
Lumbar Cistern
What is the name of the longitudinal band of white matter on the anterior surface of the spinal cord?
Linea Splendens
What are the features on both sides of the pia mater?
Denticulate (toothed) Ligaments.
What is the length of the spinal cord in adults?
45 cm.
What does the regression of coccygeal segments of the spinal cord create?
The filum terminale.
What are the segments of the spinal cord?
Cervical, thoracic, lumbar, sacral, and coccygeal segments.
What structures are shown to ascend in the spinal cord from the 14-week fetus to the 4-week infant?
Spinal nerve roots.
Which membrane is the outermost layer of the meninges?
Dura mater.
What are dermatomes?
Dermatomes are areas of skin that are mainly supplied by a single spinal nerve.
What is the internal vertebral venous plexus?
A network of veins located in the epidural space.
What is the conus medullaris?
The conus medullaris is the end of the spinal cord.
At what vertebral level does the conus medullaris end in adults?
At L1.
What are the components of spinal nerves?
Rootlets, roots, and rami.
What is a dermatome?
A dermatome is a part of the skin that is supplied by a single spinal nerve.
What are the three main components of the meninges?
Dura Mater, Arachnoid Mater, and Pia Mater.
Which spinal nerve supplies the area around the neck and shoulders?
The cervical spinal nerves.
What is the range of the lumbar cistern in the spinal column?
From L2 to S2.
How does the length of the spinal cord compare to the vertebral column?
The spinal cord is shorter than the vertebral column.
What are the tooth-like extensions of the pia mater that anchor the spinal cord called?
Denticulate Ligaments
What is a myotome?
A myotome is a part of the muscle that is supplied by a single spinal nerve.
Where does the spinal cord extend to in a 4-week infant?
To the level of L1.
What is the function of the dorsal root ganglia?
It contains the cell bodies of sensory neurons.
Which membrane is the middle layer of the meninges?
Arachnoid mater.
What type of fluid is found in the subdural space?
A very thin film of serous fluid.
What is the significance of dermatomes in clinical diagnosis?
Dermatomes help in diagnosing the level of spinal cord or nerve root damage based on sensory loss or pain in specific skin areas.
Where is the cervical enlargement located?
C3-T2 segments.
What is the composition of grey matter in the spinal cord?
It consists of neuronal cell bodies, dendrites, and unmyelinated axons.
What is the shape of the conus medullaris?
Cone-shaped.
What is the function of the anterior horn in the spinal cord's grey matter?
Motor function.
Which spinal nerve supplies the area around the buttocks and back of the legs?
The sacral spinal nerves.
What are sulci in the context of the spinal cord?
Grooves or furrows on the surface of the spinal cord.
Where is the spinal cord located?
In the vertebral canal.
What is the terminal thread of the spinal cord called?
Filum Terminale
At what stage of fetal development does the spinal cord extend to the level of L1?
40-week fetus.
What type of fibers does the posterior ramus of the spinal nerve contain?
Both motor and sensory fibers.
What are the three membranes collectively known as the meninges?
Pia mater, arachnoid mater, and dura mater.
What are the three main columns of white matter in the spinal cord?
Anterior column, Posterior column, Lateral column.
What is the anterior feature of the pia mater?
Linea Splendens (shining).
What is found in the subarachnoid space?
Cerebrospinal fluid (CSF) and spinal blood vessels.
What is the cauda equina?
The cauda equina consists of spinal nerves below L1.
What are the enlargements of the spinal cord?
Regions where the spinal cord is wider due to the presence of additional neurons.
What is the pia mater?
The innermost layer of the meninges, closely adhering to the surface of the spinal cord.
What is the cauda equina?
A bundle of spinal nerves and spinal nerve rootlets, resembling a horse's tail.
What type of fibers does the anterior root of the spinal nerve contain?
Motor fibers.
What type of fibers does the posterior root of the spinal nerve contain?
Sensory fibers.
What is the function of the lateral horn in the spinal cord's grey matter?
Autonomic nervous system function.
Which spinal nerve supplies the area around the lower back and hips?
The lumbar spinal nerves.
What is a segment in the spinal cord?
A segment is a part of the spinal cord that gives rise to a single spinal nerve.
What is the cauda equina?
A bundle of spinal nerves and spinal nerve rootlets, extending from the conus medullaris.
What is the subarachnoid septum?
A partition in the subarachnoid space on the posterior side of the spinal cord.
What are the two main enlargements of the spinal cord?
Cervical and Lumbar enlargements.
At what stage of fetal development does the spinal cord extend to the coccyx?
9-week fetus.
What is the shape of the grey matter in the spinal cord's horizontal section?
H-shape or Butterfly.
Which membrane is the innermost layer of the meninges?
Pia mater.
What structures do the meninges surround?
The brain and spinal cord.
What is found in the epidural space?
Loose areolar connective tissue, semiliquid fat, and the internal vertebral venous plexus.
What is the inferior feature of the pia mater?
Filum Terminale.
What is the conus medullaris?
The tapered, lower end of the spinal cord.
What are denticulate ligaments?
Extensions of the pia mater that anchor the spinal cord to the dura mater.
What are the main sulci found in the spinal cord's horizontal section?
Anterior Median Fissure, Posterior Median Sulcus, Anterio- and Posterolateral Sulci.
What is the function of the filum terminale?
It anchors the spinal cord to the coccyx.
What is the significance of the lumbar cistern?
It contains cerebrospinal fluid (CSF).
What is the function of the posterior horn in the spinal cord's grey matter?
Sensory function.
Which spinal nerve supplies the thumb?
The C6 spinal nerve.
What is the arachnoid matter?
A layer of the meninges located between the dura mater and the pia mater.
What are the two enlargements of the spinal cord?
Cervical (C3-T2 segments) and Lumbar (L1-S3 segments).
Where is the lumbar enlargement located?
L1-S3 segments.
What layers are shown surrounding the spinal cord in the 14-week fetus?
Pia mater and dura arachnoid.
What is the posterior feature of the pia mater?
Subarachnoid Septum.
What is the significance of the lumbar cistern for medical procedures?
It is a good site for lumbar puncture.
What is the central canal in the spinal cord?
A small, hollow channel that runs through the center of the spinal cord.
What is the composition of white matter in the spinal cord?
It consists of myelinated axons.
What is the lumbar cistern?
An enlarged subarachnoid space in the lower lumbar region, containing cerebrospinal fluid.
What type of fibers does the anterior ramus of the spinal nerve contain?
Both motor and sensory fibers.
Which spinal nerve supplies the great toe?
The L5 spinal nerve.
What is the lumbar cistern?
An enlargement of the subarachnoid space between L2 and S2 containing CSF, cauda equina, and filum terminale.
At what stage of fetal development does the spinal cord extend to the level of L5?
14-week fetus.
What is the function of the dura mater?
The dura mater is the outermost layer of the meninges that provides protection to the spinal cord.
What structures are contained within the lumbar cistern?
Cerebrospinal fluid (CSF), cauda equina, and filum terminale.
Do spinal cord segments lie opposite to the equivalent vertebra?
Most of them do not lie opposite to the equivalent vertebra.
What are the dura and arachnoid mater?
Protective membranes that cover the spinal cord.
What is the filum terminale?
A fibrous extension of the pia mater that anchors the spinal cord to the coccyx.
What is the linea splendens?
A longitudinal band of connective tissue on the anterior surface of the spinal cord.
