The spinal cord (in yellow) connects the brain to nerves throughout the body.
The human nervous system. Sky blue is PNS; yellow is CNS.
The formation of the spinal nerve from the posterior and anterior roots
Part of human spinal cord. 1 – central canal; 2 – posterior median sulcus; 3 – gray matter; 4 – white matter; 5 – dorsal root + dorsal root ganglion; 6 – ventral root; 7 – fascicles; 8 – anterior spinal artery; 9 – arachnoid mater; 10 – dura mater
3D Medical Animation still shot of Lumbosacral Plexus
Spinal nerve
Diagram of the spinal cord showing segments
Typical spinal nerve location
Scheme showing structure of a typical spinal nerve
1. Somatic efferent.
2. Somatic afferent.
3,4,5. Sympathetic efferent.
6,7. Autonomic afferent.
A model of segments of the human spine and spinal cord, nerve roots can be seen extending laterally from the (not visible) spinal cord.
Cervical nerves
Spinal cord seen in a midsection of a five-week-old embryo
Lumbar plexus and branches
Spinal cord seen in a midsection of a 3 month old fetus
Plan of sacral and pudendal plexuses
Spinal cord tracts.
Areas of distribution of the cutaneous branches of the posterior divisions of the spinal nerves. The areas of the medial branches are in black, those of the lateral in red
Spinal Cord Sectional Anatomy. Animation in the reference.
A portion of the spinal cord, showing its right lateral surface. The dura is opened and arranged to show the nerve roots.
Diagrams of the spinal cord.
Distribution of the cutaneous nerves. Ventral aspect.
Cross-section through the spinal cord at the mid-thoracic level.
Distribution of the cutaneous nerves. Dorsal aspect.
Cross-sections of the spinal cord at varying levels.
The spinal cord with dura cut open, showing the exits of the spinal nerves.
Cervical vertebra
The spinal cord showing how the anterior and posterior roots join in the spinal nerves.
A portion of the spinal cord, showing its right lateral surface. The dura is opened and arranged to show the nerve roots.
A longer view of the spinal cord.
The spinal cord with dura cut open, showing the exits of the spinal nerves.
Projections of the spinal cord into the nerves (red motor, blue sensory).
The spinal cord showing how the anterior and posterior roots join in the spinal nerves.
Projections of the spinal cord into the nerves (red motor, blue sensory).
The spinal cord showing how the anterior and posterior roots join in the spinal nerves.
Schematic diagram of cervical plexus.
A longer view of the spinal cord.
Cerebrum. Inferior view. Deep dissection.
Projections of the spinal cord into the nerves (red motor, blue sensory).
Cerebrum. Inferior view. Deep dissection.
Projections of the spinal cord into the nerves (red motor, blue sensory).
Spinal nerves. Spinal cord and vertebral canal. Deep dissection.
Cross-section of rabbit spinal cord.
Cross section of adult rat spinal cord stained using Cajal method.
An overview of the spinal cord.
Sagittal section of pig vertebrae showing a section of the spinal cord.
The base of the brain and the top of the spinal cord
Spinal cord. Spinal membranes and nerve roots.Deep dissection. Posterior view.
Spinal cord. Spinal membranes and nerve roots.Deep dissection. Posterior view.
Spinal cord. Spinal membranes and nerve roots.Deep dissection. Posterior view.
Spinal cord. Spinal membranes and nerve roots.Deep dissection. Posterior view.
Spinal cord. Spinal membranes and nerve roots.Deep dissection. Posterior view.
Spinal cord. Spinal membranes and nerve roots.Deep dissection. Posterior view.
Spinal cord. Spinal membranes and nerve roots.Deep dissection. Posterior view.
Cerebrum.Inferior view.Deep dissection
Cerebrum.Inferior view.Deep dissection
Spinal cord. Brachial plexus. Cerebrum.Inferior view.Deep dissection.
Spinal cord. Brachial plexus. Cerebrum.Inferior view.Deep dissection.
Spinal cord
Medulla spinalis of 8-week-old human embryo

A spinal nerve is a mixed nerve, which carries motor, sensory, and autonomic signals between the spinal cord and the body.

- Spinal nerve

The PNS consists of the nerves and ganglia outside the brain and spinal cord.

- Peripheral nervous system

The spinal nerves are part of the peripheral nervous system.

- Spinal nerve

Human spinal cord svg.svg spinal cord is the main pathway for information connecting the brain and peripheral nervous system. Much shorter than its protecting spinal column, the human spinal cord originates in the brainstem, passes through the foramen magnum, and continues through to the conus medullaris near the second lumbar vertebra before terminating in a fibrous extension known as the filum terminale.

- Spinal cord

The nerve roots then merge into bilaterally symmetrical pairs of spinal nerves.

- Spinal cord

For the rest of the body, spinal nerves are responsible for somatosensory information.

- Peripheral nervous system
The spinal cord (in yellow) connects the brain to nerves throughout the body.

2 related topics with Alpha

Overall

The human vertebral column and its regions

Vertebral column

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Part of the axial skeleton.

Part of the axial skeleton.

The human vertebral column and its regions
Numbering order of the vertebrae of the human spinal column
Anatomy of a vertebra
A thoracic spine X-ray of a 57-year-old male.
Lateral lumbar X-ray of a 34-year-old male
The spinal cord nested in the vertebral column.
3D Medical Animation still shot of Spina Bifida
Diagram showing normal curvature of the vertebrae from childhood to teenage
Surface projections of organs of the torso. The transpyloric line is seen at L1
A vertebra (diameter 5 mm) of a small ray-finned fish

The vertebral column houses the spinal canal, a cavity that encloses and protects the spinal cord.

The spinal nerves leave the spinal cord through these holes.

The spinal cord is part of the central nervous system that supplies nerves and receives information from the peripheral nervous system within the body.

Schematic diagram showing the central nervous system in yellow, peripheral in orange

Central nervous system

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Schematic diagram showing the central nervous system in yellow, peripheral in orange
Dissection of a human brain with labels showing the clear division between white and gray matter.
Diagram of the columns and of the course of the fibers in the spinal cord. Sensory synapses occur in the dorsal spinal cord (above in this image), and motor nerves leave through the ventral (as well as lateral) horns of the spinal cord as seen below in the image.
Different ways in which the CNS can be activated without engaging the cortex, and making us aware of the actions. The above example shows the process in which the pupil dilates during dim light, activating neurons in the spinal cord. The second example shows the constriction of the pupil as a result of the activation of the Eddinger-Westphal nucleus (a cerebral ganglion).
A map over the different structures of the nervous systems in the body, showing the CNS, PNS, autonomic nervous system, and enteric nervous system.
Schematic image showing the locations of a few tracts of the spinal cord.
Reflexes may also occur without engaging more than one neuron of the CNS as in the below example of a short reflex.
Diagram depicting the main subdivisions of the embryonic vertebrate brain, later forming forebrain, midbrain and hindbrain.
Development of the neural tube

The central nervous system (CNS) is the part of the nervous system consisting primarily of the brain and spinal cord.

Microscopically, there are differences between the neurons and tissue of the CNS and the peripheral nervous system (PNS).

From and to the spinal cord are projections of the peripheral nervous system in the form of spinal nerves (sometimes segmental nerves ).