Items tagged “anatomy”
165 results found
Article
Body of sphenoid
The body of the sphenoid bone is the midline cubical portion of the sphenoid bone, hollowed by the sphenoid air sinuses.
Gross anatomy
The body has superior, inferior, anterior, posterior, and lateral surfaces.
The superior surface features:
ethmoidal spine: prominent spine that articulates...
Article
Dorsal scapular nerve
The dorsal scapular nerve is a branch from the C5 root of the brachial plexus and supplies the rhomboid muscles.
Gross anatomy
Origin
Posterior aspect of the C5 root of the brachial plexus.
Course
It courses through scalenus medius then accompanies the dorsal scapular vessels inferiorly, de...
Article
Medial pectoral nerve
The medial pectoral nerve, also known as the medial anterior thoracic nerve arises from the medial cord of the brachial plexus and supplies both the pectoralis minor and major muscles.
Gross anatomy
Origin
The medial pectoral nerve arises from the medial cord of the brachial plexus with fibe...
Article
Innermost intercostal muscles
The innermost intercostal muscles are muscles of respiration. They are the deepest intercostal muscles located in the intercostal spaces, and contract along with the internal intercostal muscles to reduce the transverse dimension of the thoracic cavity during expiration.
Gross anatomy
The inne...
Article
Intercostal spaces
The intercostal spaces, also known as interspaces, are the space between the ribs. There are 11 spaces on each side and they are numbered according to the rib which is the superior border of the space.
Gross anatomy
The intercostal spaces contain three layers of muscle: the external, internal...
Article
Supraclavicular nerves
The supraclavicular nerves are three cutaneous nerves that emerge as a common trunk from the cervical plexus before branching to innervate the skin over the upper chest and shoulders.
Gross anatomy
Origin
The supraclavicular nerves arise from the ventral rami of C3 and C4 spinal nerves, alth...
Article
Punctum nervosum
Punctum nervosum, also known as Erb’s point or the nerve point of the neck, is a point half way along the posterior border of the sternocleidomastoid muscle from which all cutaneous branches of the cervical plexus converge and become superficial.
Gross anatomy
The punctum nervosum is located o...
Article
Lumbar plexus
The lumbar plexus is a complex neural network formed by the lower thoracic and lumbar ventral nerve roots (T12 to L5) which supplies motor and sensory innervation to the lower limb and pelvic girdle.
Summary
origin: ventral rami of T12 to L5
course: formed within the substance of the ps...
Article
Hyoid bone
The hyoid bone is a midline "U or horseshoe-shaped" bone that serves as a structural anchor in the mid-neck. It is the only bone in the human body that does not directly articulate with another bone (other than sesamoids). It is a place of convergence of multiple small neck muscles that permit t...
Article
Linea alba
The linea alba (Latin for white line) is a single midline fibrous line in the anterior abdominal wall formed by the median fusion of the layers of the rectus sheath medial to the bilateral rectus abdominis muscles. It attaches to the xiphoid process of the sternum and the pubic symphysis. The um...
Article
Angular gyrus
The angular gyrus is a portion of the parietal lobe of the brain. It is one of the two parts of the inferior parietal lobule, the other part being the supramarginal gyrus. It plays a part in language and number processing, memory and reasoning 1.
Gross anatomy
Relations
It lies as a horseshoe...
Article
Extensor carpi radialis brevis muscle
Extensor carpis radialis brevis (ECRB) muscle is a muscle of the superficial layer of the posterior compartment of the forearm. It passes through the 2nd extensor compartment of the wrist. Extensor carpi radialis brevis muscle is one of the three muscles forming the mobile wad of Henry. It is on...
Article
Hepatocystic triangle
The hepatocystic triangle (or Calot triangle) is a small triangular space at the porta hepatis of surgical importance as it is dissected during cholecystectomy. Its contents, the cystic artery and cystic duct, must be identified before ligation and division to avoid intraoperative injury.
Gros...
Article
Hands
The hand is part of the upper limb below the forearm and wrist. In the supinated anatomical position, the palm is facing anteriorly and the dorsum posteriorly.
The bones of the hand are:
carpals (8)
scaphoid
lunate
triquetrum
pisiform
trapezium
trapezoid
capitate
hamate
metacarpals (5...
Article
Thigh
Thigh refers to the portion of the lower limb between the hip and knee joints. Note that in an anatomical context "leg" refers to the portion between the knee and ankle joints and not to the entire lower limb.
Article
Leg
Leg refers to the portion of the lower limb between the knee and ankle joints. Note that this anatomical definition is different from the everyday use of the word "leg" which often refers to the entire lower limb. The upper portion of the lower limb, between hip and knee joints, is referred to a...
Article
Ilium
The ilium (plural: ilia) is one of the three bony components of the innominate bone: ilium, ischium, and pubis. These are individual bones in the immature skeleton which fuse to form one bone in adults, the principal union being in the acetabulum.
The ilium is not to be confused with the ileum:...
Article
Pubis
The pubis, together with the ilium and ischium, make up the innominate bone of the pelvis. These are individual bones in the young and unite to form one bone in adults, the principal union forming the fused acetabulum.
The pubis is the ventral part of the innominate bone and forms a median cart...
Article
Abductor pollicis brevis muscle
The abductor pollicis brevis muscle is a thin subcutaneous muscle located laterally in the thenar eminence of the hand, and is one of the intrinsic muscles of the hand.
Summary
origin: mainly from the flexor retinaculum
few fibers originate from the tubercles of scaphoid and trapezium and ten...
Article
Opponens pollicis muscle
The opponens pollicis muscle is one of the muscles of the thenar eminence, deep to abductor pollicis brevis, and is one of the intrinsic muscles of the hand. The three muscles that constitute the thenar eminence muscle group are abductor pollicis brevis, flexor pollicis brevis and opponens polli...
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