Dural

Dorsa
The human back, showing the dorsa of the body
Details
Precursor	Somite
System	Musculoskeletal system
Artery	Dorsal branches of posterior intercostal arteries
Nerve	Dorsal rami of spinal nerves
Function	Support, movement
Identifiers
Latin	Dorsum
TA98
TH	{{#property:P1694}}
TE	{{#property:P1693}}
FMA	{{#property:P1402}}
Anatomical terminology

The term dorsa refers to the posterior aspect of the human body, commonly known as the back. It encompasses the region extending from the neck to the lower back, including the spine, muscles, and skin. The dorsa play a crucial role in supporting the body, facilitating movement, and protecting the spinal cord.

Anatomy

The dorsa are composed of several key anatomical structures:

Vertebral Column

The vertebral column, or spine, is the central support structure of the dorsa. It consists of 33 vertebrae, divided into cervical, thoracic, lumbar, sacral, and coccygeal regions. The spine provides structural support and houses the spinal cord.

Muscles

The muscles of the dorsa include the trapezius, latissimus dorsi, rhomboids, and erector spinae. These muscles are responsible for movements such as extension, flexion, and rotation of the back.

Nerves

The dorsal rami of spinal nerves innervate the muscles and skin of the dorsa. These nerves emerge from the spinal cord and provide sensory and motor functions.

Blood Supply

The blood supply to the dorsa is primarily provided by the dorsal branches of posterior intercostal arteries, which supply oxygenated blood to the muscles and skin.

Function

The dorsa serve several important functions:

• Support: The vertebral column supports the weight of the head and trunk.
• Movement: Muscles of the dorsa facilitate movement and posture.
• Protection: The spine protects the spinal cord, a critical component of the central nervous system.

Clinical Significance

Conditions affecting the dorsa include:

• Scoliosis: A lateral curvature of the spine.
• Herniated disc: A condition where the intervertebral disc protrudes, causing pain.
• Muscle strain: Overstretching or tearing of muscle fibers.

Also see

• Spinal cord
• Musculoskeletal system
• Back pain
• Posture