pyramidalis muscle

Information about pyramidalis muscle

Pyramidalis muscle
The Transversus abdominis, Rectus abdominis, and Pyramidalis. (Pyramidalis labeled at bottom center.)
Latinmusculus pyramidalis
subject #118 416
Origin:pubic symphysis and pubic crest
Insertion:linea alba
Artery:
Nerve:Subcostal nerve (T12)
Action:tensing the linea alba
Dorlands/Elsevier m_22/12550348
The pyramidalis is a muscle that is considered insignificant in humans. It is small and triangular, anterior to the Rectus abdominis, and contained in the rectus sheath.

Attachments and actions

Inferiorly, it attaches to the pubic symphysis and pubic crest, arising by tendinous fibers from the anterior part of the pubis and the anterior pubic ligament.

Superiorly, the fleshy portion of the muscle passes upward, diminishing in size as it ascends, and ends by a pointed extremity which is inserted into the linea alba, midway between the umbilicus and pubis.

Therefore, when contracting, it has the function of tensing the linea alba.

Variations

It is absent in 20% of normal humans.

This muscle may be absent on one or both sides; the lower end of the rectus then becomes proportionately increased in size.

Occasionally it is double on one side, and the muscles of the two sides are sometimes of unequal size.

It may extend higher than the usual level.

Innervation

The muscle is innervated by the ventral portion of T12.

Additional images


Right hip bone. External surface.


External links

 •  • [ e]
Muscles of torso
BACKsplenius: (capitis - cervicis) - erector spinae (iliocostalis - longissimus - spinalis) - latissimus dorsi
transversospinales: (semispinalis dorsi - semispinalis cervicis - semispinalis capitis - multifidus - rotatores) - interspinales - intertransversarii
SUBOCCIPITALrectus capitis posterior (major, minor) - obliquus capitis (inferior, superior)
CHESTintercostales (external, internal, innermost) - subcostales - transversus thoracis - levatores costarum - serratus posterior (inferior, superior) - diaphragm
ABDOMENobliques (external, internal) - transversus abdominis - rectus abdominis - pyramidalis - cremaster - quadratus lumborum
PELVISlevator ani (iliococcygeus, pubococcygeus, puborectalis) - coccygeus
PERINEUMsphincter ani (externus, internus) - superficial perineal pouch (transversus perinei superficialis - bulbospongiosus - ischiocavernosus) - deep perineal pouch (transversus perinei profundus, sphincter urethrae membranaceae)
The transversus abdominis muscle, also known as the transversalis muscle and transverse abdominal muscle, is a muscle layer of the anterior and lateral abdominal wall which is just deep to (layered below) the internal oblique muscle.
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The rectus abdominis muscle (commonly known as "abs") is a paired muscle running vertically on each side of the anterior wall of the human abdomen (and in some other animals).
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The pyramidalis is a muscle that is considered insignificant in humans. It is small and triangular, anterior to the Rectus abdominis, and contained in the rectus sheath.

Attachments and actions


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Latin}}} 
Official status
Official language of: Vatican City
Used for official purposes, but not spoken in everyday speech
Regulated by: Opus Fundatum Latinitas
Roman Catholic Church
Language codes
ISO 639-1: la
ISO 639-2: lat
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bold refer to the diagram at right.)

In the skull (8):
  • 1-9. cranium
  • 7. mandible
''In the middle ears (6):
  • malleus
  • incus
  • stapes
In the throat (1):
  • hyoid
In the shoulder girdle (4):
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The pubic symphysis is the midline cartilaginous joint uniting the superior rami of the left and right pubic bones (pubis). It is located anterior to the urinary bladder and superior to the external genitalia; for females it is above the vulva and for males it is above the penis.
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Medial to the pubic tubercle is the pubic crest, which extends from this process to the medial end of the bone.

It affords attachment to the inguinal falx, and to the Rectus abdominis and Pyramidalis.
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bold refer to the diagram at right.)

In the skull (8):
  • 1-9. cranium
  • 7. mandible
''In the middle ears (6):
  • malleus
  • incus
  • stapes
In the throat (1):
  • hyoid
In the shoulder girdle (4):
..... Click the link for more information.
Linea alba can refer to:
  • Linea alba (abdomen)
  • Linea alba (teeth)

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Arteries are muscular blood vessels that carry blood away from the heart.[1] All arteries, with the exception of the pulmonary and umbilical arteries, carry oxygenated blood.

The circulatory system is extremely important for sustaining life.
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  • Accessory nerve
  • Accessory obturator nerve
  • Alderman's nerve
  • Anococcygeal nerve
  • Ansa cervicalis
  • Anterior interosseous nerve
  • Anterior superior alveolar nerve
  • Aortic plexus
  • Auerbach's plexus
  • Auriculotemporal nerve
  • Axillary nerve

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The anterior division of the twelfth thoracic nerve (subcostal nerve) is larger than the others; it runs along the lower border of the twelfth rib, often gives a communicating branch to the first lumbar nerve, and passes under the lateral lumbocostal arch.
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Kinesiology is the scientific study of the anatomy, physiology, and mechanics of body movement, especially in humans. [1] The word kinesiology is derived the Greek "kinesis" (motion) + the suffix -ology or -logy from the greek "logos" or "logia"(meaning a field of study).
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Linea alba can refer to:
  • Linea alba (abdomen)
  • Linea alba (teeth)

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Elsevier, the world's largest publisher of medical and scientific literature, forms part of the Reed Elsevier group. Based in Amsterdam, the company has substantial operations in the UK, USA and elsewhere.
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MUSCLE (multiple sequence comparison by log-expectation) is public domain, multiple sequence alignment software for protein and nucleotide sequences.
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The rectus abdominis muscle (commonly known as "abs") is a paired muscle running vertically on each side of the anterior wall of the human abdomen (and in some other animals).
..... Click the link for more information.
The Rectus sheath is formed by the aponeuroses of the Obliqui and Transversus. It contains the Rectus abdominis and Pyramidalis muscles.

The arrangement of the layers has important variations at different locations in the body.
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The pubic symphysis is the midline cartilaginous joint uniting the superior rami of the left and right pubic bones (pubis). It is located anterior to the urinary bladder and superior to the external genitalia; for females it is above the vulva and for males it is above the penis.
..... Click the link for more information.
Medial to the pubic tubercle is the pubic crest, which extends from this process to the medial end of the bone.

It affords attachment to the inguinal falx, and to the Rectus abdominis and Pyramidalis.
..... Click the link for more information.
Pubis may refer to the following:
  • Pubis (bone)
  • Mons pubis, a padding of fat that protects the pubis bone

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Linea alba can refer to:
  • Linea alba (abdomen)
  • Linea alba (teeth)

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Umbilicus may refer to:
  • Umbilicus (mollusk), a feature of gastropod shell anatomy
  • Umbilicus (genus), a genus of 15-20 species of flowering plants
  • Umbilicus urbis Romae, the designated centre of the city of Rome from which and to which all distances in Rome

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Pubis may refer to the following:
  • Pubis (bone)
  • Mons pubis, a padding of fat that protects the pubis bone

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Linea alba can refer to:
  • Linea alba (abdomen)
  • Linea alba (teeth)

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GPnotebook is a British medical database for general practitioners (GPs).[1] It is an online encyclopaedia of medicine that provides an immediate reference resource for clinicians worldwide. The database consists of over 30,000 pages of information.
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Loyola University Chicago is a private co-educational religious-affiliated university established in Chicago in 1870 as Saint Ignatius College. It was founded by the Roman Catholic religious order of the Society of Jesus and bears the name of the Jesuit patron, Saint Ignatius of
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The State University of New York Health Science Center at Brooklyn, better known as SUNY Downstate Medical Center, is an academic medical center and is the only one of its kind in the Borough of Brooklyn in New York City.
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State University of New York, abbreviated SUNY (IPA pronunciation: ['suniː]) is a system of public institutions of higher education in New York, United States.
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