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What nerve causes the deaphragm to contract and initiate inhalation?
The phrenic nerve is responsible for stimulating the diaphragm to contract and initiate the process of inhalation. It arises from the spinal cord and plays a crucial role in controlling breathing by sending signals to the diaphragm muscle.
Why are there 31 pairs of spinal nerve yet you only have 30 vertebrae?
There are 31 pairs of spinal nerves because the first cervical nerve exits above the first cervical vertebra. The remaining spinal nerves exit below their corresponding vertebrae. Therefore, there is one more pair of spinal nerves than there are vertebrae in the spinal column.
Is there any connection between spinal cervical 1 2 3 and cervical cancer?
No.
Why are there eight cervical nerve roots?
There are 8 cervical nerves because the first 7 nerves exits on the upper part of the vertebrae making up 7 nerves but then on the 7th vertebrae there's another nerve that exits below the vertebrae thus making up 8 cervical nerves from 7 cervical vertebrae.
What are the 3 main parts of nervous system?
1. brain 2. spinal cord 3. nerves
What 3 nerves form the cervical plexus?
There are more than 3 nerves in the cervical plexus. The most important nerve here is the phrenic nerve, which supplies the diaphragm, from roots C3-5. Other deep branches include the ansa cervicalis and segmental branches; the superficial branches are the lesser occipital, great auricular, transverse cervical and supraclavicular.
Is the posterior interosseous nerve a cranial nerve or a spinal nerve?
what does ninth cranial nerve control? glossopharyngeal nerve is a mixed nerve, it has sensory and motor part. the sensory is at the poserior 1/3 of the tongue. It also is part of the pharyngeal plexus. (9,10,11) The motor part of the nerve ONLY supply the stylopharyngeus muscle!
Who protects the spinal cords?
In anatomy, the accessory nerve is a nerve that controls specific muscles of the neck. As a part of it was formerly believed to originate in the brain, it is considered a cranial nerve. Based on its location relative to other such nerves, it is designated the eleventh of twelve cranial nerves, and is thus abbreviated CN XI. Although anatomists typically refer to the accessory nerve in singular, there are in reality two accessory nerves, one on each side of the body.Traditional descriptions of the accessory nerve divide it into two parts: a spinal part and a cranial part.[1] But because the cranial component rapidly joins the vagus nerve and serves the same function as other vagal nerve fibers, modern descriptions often consider the cranial component part of the vagus nerve and not part of the accessory nerve proper.[2] Thus in contemporary discussions of the accessory nerve, the common practice is to dismiss the cranial part altogether, referring to the accessory nerve specifically as the spinal accessory nerve.The spinal accessory nerve provides motor innervation from the central nervous system to two muscles of the neck: the sternocleidomastoid muscle and the trapezius muscle. The sternocleidomastoid muscle tilts and rotates the head, while the trapezius muscle has several actions on the scapula, including shoulder elevation and adduction of the scapula.Range of motion and strength testing of the neck and shoulders can be measured during a neurological examination to assess function of the spinal accessory nerve. Limited range of motion or poor muscle strength are suggestive of damage to the spinal accessory nerve, which can result from a variety of causes. Injury to the spinal accessory nerve is most commonly caused by medical procedures that involve the head and neck.[3]
What would happen if the following structures were damaged or transected 1. dorsal root of spinal nerve 2. ventral root of spinal cord 3. ventral ramus of spinal cord?
loss of both the motor and sensory functions
Facts about the spinal cord?
1. The spinal cord can actually work independently of the brain, sending out responses to the muscles directly.2. There are about 13, 500, 00 neurons in the human spinal cord.3. A baby can lose about half of their nerve cells before they are born.
What are vertebrae and what is their function?
A vertebrae are bones in the spinal column (also called spine or backbone)The function of the spinal column is to protect the soft spinal cord and to support the body and hold the head upright.Plural for vertebra. Bony segments forming the human spinal column.31-33 total vertebrae (most adults have 33 total vertebrae)Cervical vertebrae (C1-C7): 7Thoracic vertebrae (T1-T12): 12Lumbar vertebrae (L1-L5): 5Sacral vertebrae (S1-S5): 5Coccygeal vertebrae: 3-5IT IS THE SMALL BONES THAT FORM THE SPINAL CORDvertebrae i a series of bones to make up the spine. A vertabrae is an animal with a back bone. There are five classes of vertabrae: amphibeans, birds, fish, mamals, and reptiles.
Which of the cranial nerves deals primarily with motor function?
Motor only CNIII Oculomotor nerve CN IV Trochlear/pathic nerve CN VI Abducens nerve CN XI Accessory/spinal accessory nerve CN XII Hypoglossal nerve Both motor and sensory CN V Trigeminal/dentist nerve CN VII Facial nerve CN IX Glossopharyngeal nerve CN X Vagus nerve
