Why are there 7 cervical vertebrae but 8 cervical nerves?

Why are there 7 cervical vertebrae but 8 cervical nerves?

Because there are only seven cervical vertebrae, the first seven cervical nerves exit above the same numbered cervical vertebrae. The eighth cervical nerve exits above the T1 vertebrae, and the rest of the spinal nerves (T2 to L5) exit below their same numbered vertebrae.

How many cervical vertebrae are there 7 or 8?

In the cervical segments, there are 7 cervical vertebrae and 8 cervical nerves (Figure 3.2). C1-C7 nerves exit above their vertebrae whereas the C8 nerve exits below the C7 vertebra.

Are there 7 cervical vertebrae?

The cervical spine is made up of 7 vertebrae. The first 2, C1 and C2, are highly specialized and are given unique names: atlas and axis, respectively. C3-C7 are more classic vertebrae, having a body, pedicles, laminae, spinous processes, and facet joints.

How many cervical vertebrae are there?

The cervical spine, comprised of seven cervical vertebrae referred to as C1 to C7, is divided into two major segments: the craniocervical junction (CCJ) and the subaxial spine. The CCJ includes the occiput and the two most cephalad cervical vertebrae known as the atlas (C1) and the axis (C2).

How many cervical nerves are there quizlet?

There are 31 pairs of spinal nerves: cervical (8 pairs), thoracic (12 pairs), lumbar (5 pairs), sacral (5 pairs), and one pair of coccygeal nerves.

Where is C7 and C8 located?

The C6 and C7 cervical vertebrae (and the C8 spinal nerve) form the lowest levels of the cervical spine and directly impact the arm and hand muscles. The locations of C6 and C7 vertebrae are both in the lowest levels of the cervical spine, near the base of the neck.

Where is your 7th vertebrae?

The 7th cervical (C7) vertebra is the largest and most inferior vertebra in the neck region. Unlike the other cervical vertebrae, the C7 has a large spinous process that protrudes posteriorly toward the skin at the back of the neck.

Where is C5 6 and C6 7 located?

cervical spine
The C5-C6 spinal motion segment (located in the lower cervical spine just above the C7 vertebra) provides flexibility and support to much of the neck and the head above.

How many thoracic vertebrae are there *?

12 vertebrae
It is the second segment of the vertebral column that runs between the cervical and lumbar segments. There are 12 vertebrae in total, separated by intervertebral discs. Before you get too lost in the big words, the thoracic spine basically spans your back from neck to lower back.

Where is the C7 vertebrae?

neck
The 7th cervical (C7) vertebra is the largest and most inferior vertebra in the neck region. Unlike the other cervical vertebrae, the C7 has a large spinous process that protrudes posteriorly toward the skin at the back of the neck.

How many pairs of cranial nerves are there in the cervical region quizlet?

Can you name them? There are 31 pairs of spinal nerves: cervical (8 pairs), thoracic (12 pairs), lumbar (5 pairs), sacral (5 pairs), and one pair of coccygeal nerves.

Which nerve arises from the cervical plexus quizlet?

The phrenic nerve, which arises from the cervical plexus, supplies both motor and sensory fibers to the diaphragm, the main breathing muscle.

What nerves are affected by C3 and C4?

The posterior distribution includes the suboccipital nerve (C1), the greater occipital nerve (C2) and the third occipital nerve (C3). The anterior distribution includes the cervical plexus (C1-C4) and brachial plexus (C5-T1). The cervical nerves innervate the sternohyoid, sternothyroid and omohyoid muscles.

Where is C8 vertebrae?

Cervical nerves. The cervical nerves are the spinal nerves from the cervical vertebrae in the cervical segment of the spinal cord. Although there are seven cervical vertebrae (C1-C7), there are eight cervical nerves C1 – C8. All cervical nerves except C8 emerge above their corresponding vertebrae, while the C8 nerve emerges below the C7 vertebra.

How many cervical vertebrae C8?

However although there are seven vertebrae, there are eight cervical nerve roots, labeled C1 – C8. The cervical nerve roots exit above the corresponding vertebrae, with the C8 nerve root exiting beneath the C7 vertebrae.

Which cervical nerves control hands?

C1, C2, and C3 (the first three cervical nerves) control the head and neck, including movements forward, backward, and to the sides. These nerves also play key roles in breathing. The C2 dermatome handles sensation for the upper part of the head, and the C3 dermatome covers the side of the face and behind the head.