Shells and interobox spaces of the spinal cord - Anatomy...

Shells and interobox spaces of the spinal cord

The spinal cord is located in the vertebral canal. However, between the walls of the canal and the surface of the spinal cord there is a space 3-6 mm wide, in which the meninges and the contents of the intershell spaces are located.

The spinal cord is covered by three shells - soft, spidery and firm.

1. The soft shell of the spinal cord is strong and fairly elastic, directly attached to the surface of the spinal cord. At the top, it passes into the soft shell of the brain. The thickness of the soft shell is about 0.15 mm. It is rich in blood vessels that provide blood supply to the spinal cord, therefore it has a pinkish white color.

From the lateral surface of the soft membrane, closer to the anterior roots of the spinal nerves, the jagged ligaments leave. They are located in the frontal plane and have the form of triangular teeth. The tips of the teeth of these ligaments are covered by the processes of the arachnoid membrane and terminate on the inner surface of the hard shell in the middle between two neighboring spinal nerves. The duplication of the soft shell is immersed in the anterior median slit even in the process of development of the spinal cord and in the adult becomes a septum.

2. The spinal cord of the spinal cord is located outside the soft shell. It does not contain blood vessels and is a thin transparent film with a thickness of 0.01-0.03 mm. This shell has numerous slit-like holes. In the region of the large occipital foramen, it passes into the arachnoid casing of the brain, and below, at level 11 of the sacral vertebra, merges with the soft membrane of the spinal cord.

3. The hard shell of the spinal cord is its outer shell (Figure 2.9).

It is a long connective tissue tube, separated from the periosteum of the vertebrae by the epidural (epidural) space. In the region of the large occipital foramen, it continues into the hard shell of the brain. At the bottom, the hard shell ends with a cone going up to level II of the sacral vertebra. Below this level, it merges with the other shells of the spinal cord into the common envelope of the terminal thread. The thickness of the hard shell of the spinal cord is from 0.5 to 1.0 mm.

From the lateral surface of the hard shell are separated sprouts in the form of sleeves for spinal nerves. These sheath vaginas extend into the intervertebral foramen, cover the sensory node of the spinal nerve and continue into the perineural vagina of the spinal nerve.

Shells and intercellular spaces of the spinal cord.

Fig. 2.9. Shells and intercellular spaces of the spinal cord. Cut in the horizontal plane:

1 - periosteum of the vertebra; 2 - solid membrane of the spinal cord; 3 - spinal cord of the spinal cord; 4 - subarachnoid ligaments; 5 - epidural space; 6 - subdural space; 7 - subarachnoid space; 8 - a dentate ligament; 9 - sensory node of the spinal nerve; 10 - posterior spine of spinal nerve; 11 - anterior spine of spinal nerve; 12 - soft membrane of the spinal cord

Between the inner surface of the spinal canal and the hard shell is a space called epidural. The contents of this space are adipose tissue and internal vertebral venous plexuses. Between the hard and arachnoid shells there is a slit subdural space containing a small amount of cerebrospinal fluid. Between the arachnoid and soft membranes is the subarachnoid space, also containing cerebrospinal fluid.

">

Also We Can Offer!

Other services that we offer

If you don’t see the necessary subject, paper type, or topic in our list of available services and examples, don’t worry! We have a number of other academic disciplines to suit the needs of anyone who visits this website looking for help.

How to ...

We made your life easier with putting together a big number of articles and guidelines on how to plan and write different types of assignments (Essay, Research Paper, Dissertation etc)