Spinal cord surgery

2021-02-12 12:00 AM

Later, because the growth rate of the spine is faster than that of the spinal cord, the spinal cord is terminally at the lower margin of lumbar vertebra 1 or the upper margin of lumbar vertebrae 2

Outward appearance

The spine is located in the spinal canal from C1 to L1 or L2. Look straight, the medulla is upright; Skewed view, the spinal cord has two bends in the direction of the spine. In the neck, the medullary medulla is concave backward; in back, concave forward.

Dendritic spines are flat, grey-white, 42- 45cm long, with two bulges, phlegmon and lumbar bulge, corresponding to brachial plexus and lumbar plexus. The marrow cap is the end of the thorn’s marrow, connected to the end wire that runs down the coccyx.


The spinal cord is divided into segments of the medulla corresponding to each pair of spinal nerves. There are 31 medullary segments divided as follows:

Neck: for 8 pairs of neck nerves.

Chest: for 12 pairs of chest nerves.

Lumbar part: for 5 pairs of lumbar nerves.

Medullary cone: for 5 pairs of nerve and 1 pair of coccyges

Figure. Marrow

  1. Grey matter 2. White matter 3. Meningitis 4. Posterior roots of the spinal cord 5. Anterior roots of the spinal cord 6. Anterior branches

 Body shape

Grey matter: inside, shaped like H. Horizontal line is the central medium. The vertical stroke has 3 horns: the front horn is the movement horn, the second is the sensory horn, the middle is the lateral horn.

White matter: surrounds the grey matter, consists of two halves, each half consists of 3 ropes: front, lateral and posterior ropes.

Central canal: small, located between the spinal cord, and is connected above with the IV ventricle.

Relate to

Relationship between spiny crown location with medullary segments and spina bifida

During the first two months of the fetus, the spinal cord occupies the full length of the spinal canal. More and later, due to the faster growth rate of the spine compared to the spinal cord, so the spinal cord is terminally at the lower margin of lumbar vertebrae 1 or the upper margin of lumbar vertebrae 2. Thus, the height of each the medullary segment is shorter than the height of the corresponding vertebra, so a segment of the pulp will not be directly related to the corresponding vertebra (or vertebra of the same name), each vertebra will be associated with a lower segment of the pulp. than.

Figure. Hemp: positions and curves

In the neck: the number of segments of the spinal cord and spinal nerves = the number of vertebrae + 1. For example, when we feel the spine vertebrae 5, the segment of the spinal cord and the spinal nerve pair escape to that level: C6.

In the upper chest (T1 - T5), number of medullary segments = number of spines + 2.

In the lower chest (T6 - T10), number of pulp segments = number of spines + 3.

Pectoral vertebrae 11 and the just below spine space associated with three lumbar medullary segments 2,3,4.