What Innervates the external urethral sphincter?
The urethral sphincter complex receives both somatic and autonomic innervation. These supply its voluntary and involuntary components, respectively. The skeletal muscle fibers of the external urethral sphincter receive somatic motor innervation from the perineal branches of the pudendal nerve (S2-4). …
What is levator ani muscle?
Introduction. The levator ani is a complex funnel-shaped structure mainly composed of striated muscle, with some smooth muscle component.[1] Located on either side of the lower pelvis, it takes part in supporting and raising the pelvic floor and allows various pelvic structures to pass through it.
What controls the internal urethral sphincter?
It prevents urine leakage as the muscle is tonically contracted via sympathetic fibers traveling through the inferior hypogastric plexus and vesical nervous plexus. Specifically, it is controlled by the hypogastric nerve, predominantly via the alpha-1 receptor.
What is a sphincter Vesicae?
Noun. 1. musculus sphincter vesicae – the sphincter muscle of the urinary bladder; made up of a thickened muscular layer of bladder around the urethral opening. bladder sphincter. urinary bladder – a membranous sac for temporary retention of urine.
What is the external urethral sphincter composed of?
striated muscle
The internal urethral sphincter is made of a layer of smooth muscle that is surrounded by striated muscle. The external urethral sphincter is composed of striated muscle and is located distally and inferiorly to the bladder neck in women between the vaginal orifice and clitoris.
What controls Urineflow?
The internal urethral sphincter and the external urethral sphincter both provide muscle control for the flow of urine. The internal sphincter is involuntary. It surrounds the opening of the bladder to the urethra and relaxes to allow urine to pass. The external sphincter is voluntary.
Where is the levator Palpebrae Superioris?
The levator palpebrae superioris muscle origin is the periosteum of the lesser wing of the sphenoid bone, superior to the optic foramen. The muscle travels anteriorly along the superior aspect of the orbit superior to the superior rectus muscle.
What Innervates the Coccygeus muscle?
Nerve supply The coccygeus muscle is innervated by the pudendal nerve, which runs between it and the piriformis muscle.
What is the innervation of internal urethral sphincter?
The innervation of the urethral sphincter is from both the somatic and the autonomic nervous systems. Urination is prevented by the voluntary motor innervation of the EUS muscle. The striated sphincter is innervated by the pudendal nerve from the S2 to S4 nerve roots [28,29].
What is the internal urethral sphincter composed of?
The internal urethral sphincter is made of a layer of smooth muscle that is surrounded by striated muscle. The external urethral sphincter is composed of striated muscle and is located distally and inferiorly to the bladder neck in women between the vaginal orifice and clitoris.
What is internal sphincter?
The internal sphincter is part of the inner surface of the canal; it is composed of concentric layers of circular muscle tissue and is not under voluntary control. The external sphincter is a layer of voluntary (striated) muscle encircling the outside wall of the anal canal… In human digestive system: Rectum and anus.
Where does the innervation of the heart come from?
Innervation of the heart. The heart receives innervation from both the superficial and deep cardiac plexuses, which have both parasympathetic (from vagus nerve) and sympathetic inputs, which provide post-ganglionic fibres to the sinoatrial (SA) and atrioventricular (AV) nodes, as well other parts of the cardiac conduction system. The cardiac…
How is the urethral sphincter related to the levator ani?
The external urethral sphincter is closely related to the levator ani, deep transverse perineal and rectourethral muscles. The puboperineal component of the levator ani muscle, forms an open circle around the external sphincter creating a hiatus at the ventral aspect.
How are sympathetic nerves responsible for the heart beat?
Sympathetic nerves are responsible for: the ‘fight or flight’ response, causing our heart to beat faster. Afferent fibres also form part of the cardiac plexus. They return to the central nervous system via both the sympathetic cardiac branches and the cardiac nerves from the right and left vagus nerves.
Which is responsible for the contraction of the heart?
The network of nerves supplying the heart receives contributions from the right and left vagus nerves, as well as contributions from the sympathetic trunk. These are responsible for influencing heart rate, cardiac output, and contraction forces of the heart.