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Abdominal muscles cover the anterior and lateral abdominal region and meet at the anterior midline. These muscles of the anterolateral abdominal wall can be divided into four groups: the external obliques , the internal obliques , the transversus abdominis , and the rectus abdominis .
The external oblique functions to pull the chest downwards and compress the abdominal cavity, which increases the intra-abdominal pressure as in a Valsalva maneuver.It also performs ipsilateral (same side) side-bending and contralateral (opposite side) rotation: the right external oblique would side-bend to the right and rotate to the left, and vice versa.
The muscle extends from the pubic symphysis, pubic crest and pubic tubercle inferiorly, to the xiphoid process and costal cartilages of the 5th–7th ribs superiorly. [1] [2] The rectus abdominis muscle is contained in the rectus sheath, which consists of the aponeuroses of the lateral abdominal muscles.
Firstly as an accessory muscle of respiration, it acts as an antagonist (opponent) to the diaphragm, helping to reduce the volume of the chest cavity during exhalation. When the diaphragm contracts, it pulls the lower wall of the chest cavity down, increasing the volume of the lungs which then fill with air.
1 frontalis: head, occipitofrontalis, forehead (left/right) skin of eyebrow and glabella: epicranial aponeurosis: ophthalmic artery: facial nerve [CNVII], temporal branch: wrinkles eyebrow: procerus, corrugator supercilii, and orbicularis oculi muscles [1] 2 1 orbicularis oculi, orbital part head, forehead/eyelid (left/right) frontal bone ...
Anatomy photo:35:17-0100 at the SUNY Downstate Medical Center - "Anterior Abdominal Wall: The Transversus Abdominis Muscle" Anatomy figure: 40:07-06 at Human Anatomy Online, SUNY Downstate Medical Center - "Muscles and nerves of the posterior abdominal wall." Anatomy image:7183 at the SUNY Downstate Medical Center
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Abdominal exercises are a type of strength exercise that affect the abdominal muscles (colloquially known as the stomach muscles or "abs"). Human abdominal consist of four muscles which are the rectus abdomens, internal oblique, external oblique, and transversus abdominis. [1] When performing abdominal exercises it is important to understand ...