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  2. Pectinate muscles - Wikipedia

    en.wikipedia.org/wiki/Pectinate_muscles

    Pectinate muscles make up the part of the wall in front of this, the right atrial appendage. [citation needed] In the left atrium, the pectinate muscles are confined to the inner surface of its atrial appendage. [1] They tend to be fewer and smaller than in the right atrium.

  3. Crista terminalis - Wikipedia

    en.wikipedia.org/wiki/Crista_terminalis

    The crista terminalis provides the origin for the pectinate muscles. [citation needed] The sinoatrial node is located in the superior part of the crista terminalis at the junction of the right atrium, and superior vena cava. [2]: 60

  4. Internal anal sphincter - Wikipedia

    en.wikipedia.org/wiki/Internal_anal_sphincter

    The internal anal sphincter is the specialised thickened terminal portion of the inner circular layer of smooth muscle of the large intestine. It extends from the pectinate line (anorectal junction) proximally to just proximal to the anal orifice distally (the distal termination is palpable). Its muscle fibres are arranged in a spiral (rather ...

  5. Pectinate line - Wikipedia

    en.wikipedia.org/wiki/Pectinate_line

    The pectinate line (dentate line) is a line which divides the upper two-thirds and lower third of the anal canal. Developmentally, this line represents the hindgut - proctodeum junction. It is an important anatomical landmark in humans, and forms the boundary between the anal canal and the rectum according to the anatomic definition. [ 1 ]

  6. Neuromuscular junction - Wikipedia

    en.wikipedia.org/wiki/Neuromuscular_junction

    It allows the motor neuron to transmit a signal to the muscle fiber, causing muscle contraction. [2] Muscles require innervation to function—and even just to maintain muscle tone, avoiding atrophy. In the neuromuscular system, nerves from the central nervous system and the peripheral nervous system are linked and work together with muscles. [3]

  7. Nervous system - Wikipedia

    en.wikipedia.org/wiki/Nervous_system

    The enteric nervous system functions to control the gastrointestinal system. Nerves that exit from the brain are called cranial nerves while those exiting from the spinal cord are called spinal nerves. The nervous system consists of nervous tissue which, at a cellular level, is defined by the presence of a special type of cell, called the ...

  8. Pectineal - Wikipedia

    en.wikipedia.org/wiki/Pectineal

    Musculi pectinati of the heart, also known as pectinate muscles; Pectineus muscle, an adductor of the thigh; Pectineal line (femur) Pectineal line (pubis), also known as the pecten pubis; Pectineal ligament, or Cooper's Ligament, located along the pecten pubis

  9. Trabeculae carneae - Wikipedia

    en.wikipedia.org/wiki/Trabeculae_carneae

    The trabeculae carneae (columnae carneae or meaty ridges) are rounded or irregular muscular columns which project from the inner surface of the right and left ventricle of the heart. [1] These are different from the pectinate muscles, which are present in the atria of the heart. In development, trabeculae carneae are among the first of the ...