Table of Contents
- 1 What is a strand of fibrous tissue that provides longitudinal support to the spinal cord as a component of the coccygeal ligament?
- 2 What provides longitudinal support of the spinal cord?
- 3 What fibers are contained within the spinal nerves of the spinal cord?
- 4 What happens if the dorsal root of a spinal nerve is severed?
- 5 What is the function of the structure labeled 12 spinal cord?
- 6 What are the major components of a spinal nerve?
What is a strand of fibrous tissue that provides longitudinal support to the spinal cord as a component of the coccygeal ligament?
The filum terminale. is a strand of fibrous tissue that provides longitudinal support as a component of the coccygeal ligament. gray commissures have. axons crossing from one side of the spinal cord to the other within the gray matter.
What provides longitudinal support of the spinal cord?
It is one of the modifications of pia mater. It gives longitudinal support to the spinal cord and consists of two parts: The upper part, or filum terminale internum, is about 15 cm long and reaches as far as the lower border of the second sacral vertebra….Filum terminale.
| Terminal filum | |
|---|---|
| FMA | 83977 |
| Anatomical terminology |
What fibers are contained within the spinal nerves of the spinal cord?
Three general nerve fiber types can be distinguished in the spinal cord white matter: 1) long ascending nerve fibers originally from the column cells, which make synaptic connections to neurons in various brainstem nuclei, cerebellum and dorsal thalamus, 2) long descending nerve fibers originating from the cerebral …
What is the layer of connective tissue that surrounds individual axons within a peripheral nerve?
Motor nerves have only efferent fibers, long axons of motor neurons. Mixed nerves contain both types of fibers. A connective tissue sheath called the epineurium surrounds each nerve. Each bundle of nerve fibers is called a fasciculus and is surrounded by a layer of connective tissue called the perineurium.
What are the specialized membranes that surround the spinal cord?
The meninges are three membrane layers which cover the brain and spinal cord. The layers are the dura, arachnoid, and pia mater.
What happens if the dorsal root of a spinal nerve is severed?
The lateral division of the dorsal root contains lightly myelinated and unmyelinated fibres of small diameter. These carry pain and temperature sensation. If the dorsal root of a spinal nerve were severed it would lead to numbness in certain areas of the body.
What is the function of the structure labeled 12 spinal cord?
The Spinal Cord, Spinal Nerves and Spinal Reflexes
| Question | Answer |
|---|---|
| Use Figure 13-1 The Spinal Cord What is the function of the structure labeled “12”? | somatic sensory – monitor skin |
| Use Figure 13-1 The Spinal Cord What is the function of the structure labeled “14”? | visceral motor – innervates organs, glands and smooth muscle |
What are the major components of a spinal nerve?
Thus, all the spinal nerves are composed of both sensory and motor fibers (mixed nerves). There are eight cervical, twelve thoracic, five lumbar, five sacral nerves and one coccygeal nerve (all in pairs), each one emerging out of their corresponding intervertebral foramina (bony openings) of the vertebral canal.
Where does spinal cord end in adults?
In adults, the cord terminates at the level of L1-L2. Thus the cord spans within 20 bony vertebrae. In a child, it terminates at the upper border of L3.