Items tagged “muscles”
17 results found
Article
Psoas major muscle
The psoas major muscle (usually shortened to just the psoas muscle) is one of the muscles of the posterior abdominal wall and lies not in the retroperitoneum but posterior to it, in the iliopsoas compartment.
Summary
origin: vertebral bodies, intervertebral discs and transverse processes of T1...
Article
Extraocular muscles
The extraocular muscles (EOMs) are the six skeletal muscles that insert onto the eye and hence control eye movements.
Terminology
The extraocular muscles maybe subdivided into the recti muscles and the oblique muscles.
Action
A summary of the principal actions of each muscle are given below....
Article
Ocular adductors
The ocular adductors are the extra-ocular muscles responsible of adduction of the globe:
medial rectus (primary function)
inferior rectus (tertiary function)
superior rectus (tertiary function)
Article
Eye movements
Eye movements are a complex set of movements of the globe that are performed by the extraocular muscles. Although each of the muscles have different primary actions on the eye, they rarely act alone and most eye movements involve a combination of synergistic and antagonistic muscles 1.
Abductio...
Article
Ocular abductors
The ocular abductors are the extra-ocular muscles responsible for abduction of the globe:
lateral rectus (primary function)
superior oblique (tertiary function)
inferior oblique (tertiary function)
Article
Ocular elevators
The ocular elevators are the extra-ocular muscles responsible for elevation of the globe:
superior rectus (primary function)
inferior oblique (secondary function)
Article
Ocular internal rotators
The ocular internal (medial) rotators are the extra-ocular muscles responsible for internal rotation (intorsion) of the globe:
superior oblique (primary function)
superior rectus (secondary function)
Article
Ocular external rotators
The ocular external (lateral) rotators are the extra-ocular muscles responsible for external rotation (extorsion) of the globe:
inferior oblique (primary function)
inferior rectus (secondary function)
Article
Superior oblique muscle
The superior oblique muscle is one of the six extraocular muscles that control eye movements. It abducts, depresses and internally rotates the eye.
Summary
innervation: trochlear nerve (CN IV)
origin: lesser wing of sphenoid bone adjacent to the annulus of Zinn
course: tendon passes through ...
Article
Inferior oblique muscle
The inferior oblique muscle is one of six extraocular muscles that control eye movements.
Summary
innervation: inferior branch of the oculomotor nerve (CN III)
origin: orbital surface of the maxilla
insertion: globe (posterior, lateral surface)
primary function: one of two ocular external r...
Case
Flexor and extensor insertions at the hand and wrist
Published
24 Aug 2011
38% complete
Diagram
Case
Thigh muscles: cross sectional anatomy
Published
19 Feb 2012
7% complete
Diagram
Article
Biceps brachii muscle
The biceps brachii muscle (also known simply as biceps) is a two-headed muscle in the anterior compartment of the arm that flexes at the elbow and supinates the forearm.
Summary
origin
short head: coracoid process of the scapula
long head: supraglenoid tubercle of the scapula
insertion: rad...
Article
Brachialis muscle
The brachialis muscle is one of the three muscles of the anterior compartment of the upper arm. Unlike biceps brachii (which is also a supinator) it acts only to flex the elbow. Isolated brachialis injuries are rare.
Summary
Brachialis has a large superficial head and a smaller deep head.
Th...
Article
External intercostal muscle
The external (or outermost) intercostal muscles are important muscles of respiration. They number eleven on each side and are located in the intercostal space, expanding the transverse dimension of the thoracic cavity during inspiration.
Gross anatomy
The external intercostal muscles are the o...
Article
Internal intercostal muscle
The internal intercostal muscles are important muscles of respiration. They number eleven on each side and are located in the intercostal spaces, reducing the transverse dimension of the thoracic cavity during expiration.
Gross anatomy
The internal intercostal muscles are the middle muscle of ...
Case
Masticatory muscle hypertrophy
Published
24 Apr 2020
83% complete
MRI