Difference between revisions of "SACRAL PLEXUS-ANTERIOR RAMI BRANCHES (BEFORE DIVISION)"

Latest revision as of 11:29, 1 January 2023

SUMMARY

6 Ps1. S1 + 2 => Piriformis nerve.

2. S2 + 3 => Perforating cutaneous nerve - pierces the sacrotuberous ligament to supply a small portion of skin over the medial side of the buttock.
3. S2 + 3 => Posterior femoral cutaneous nerve - runs below the piriformis on the sciatic nerve (it lies on the fascia lata which separates it from the sciatic nerve). It runs as far as the lower ends of the gastroc bellies and supplies an area of skin b/w the anterior and posterior axial lines from buttock to mid-calf. Gives off gluteal and perineal branches.

4. S2 + 3 + 4 => Pelvic splanchnic nerves - constitute the sacral parasympathetic outflow.
5. S2 + 3 + 4 => Pudendal nerve - runs down and curves around the coccygeus muscle to enter the pudendal canal.
6. S2 + 3 + 4 => Perineal branch of the pudendal nerve - sensory to the posterior 2/3 of the scrotum/labium, motor to the muscles of the urogenital triangle.

Reference(s)

R.M.H McMinn (1998). Last’s anatomy: regional and applied. Edinburgh: Churchill Livingstone.
Gray, H., Carter, H.V. and Davidson, G. (2017). Gray’s anatomy. London: Arcturus.

@@ Line 1: / Line 1: @@
 ===== [[Summary Article|'''SUMMARY''']] =====
-<i>6 Ps</i>
+<i>6 Ps</i>1. S1 + 2 =&gt; Piriformis nerve.
-<br/>1. S1 + 2 => Piriformis nerve.
 <br/>
-<br/>2. S2 + 3 => Perforating cutaneous nerve - pierces the sacrotuberous ligament to supply a small portion of skin over the medial side of the buttock.
+<br/>2. S2 + 3 =&gt; Perforating cutaneous nerve - pierces the sacrotuberous ligament to supply a small portion of skin over the medial side of the buttock.
-<br/>3. S2 + 3 => Posterior femoral cutaneous nerve - runs below the piriformis on the sciatic nerve (it lies on the fascia lata which separates it from the sciatic nerve). It runs as far as the lower ends of the gastroc bellies and supplies an area of skin b/w the anterior and posterior axial lines from buttock to mid-calf. Gives off gluteal and perineal branches.
+<br/>3. S2 + 3 =&gt; Posterior femoral cutaneous nerve - runs below the piriformis on the sciatic nerve (it lies on the fascia lata which separates it from the sciatic nerve). It runs as far as the lower ends of the gastroc bellies and supplies an area of skin b/w the anterior and posterior axial lines from buttock to mid-calf. Gives off gluteal and perineal branches.
 <br/>
-<br/>4. S2 + 3 + 4 => Pelvic splanchnic nerves - constitute the sacral parasympathetic outflow.
+<br/>4. S2 + 3 + 4 =&gt; Pelvic splanchnic nerves - constitute the sacral parasympathetic outflow.
-<br/>5. S2 + 3 + 4 => Pudendal nerve - runs down and curves around the coccygeus muscle to enter the pudendal canal.
+<br/>5. S2 + 3 + 4 =&gt; Pudendal nerve - runs down and curves around the coccygeus muscle to enter the pudendal canal.
-<br/>6. S2 + 3 + 4 => Perineal branch of the pudendal nerve - sensory to the posterior 2/3 of the scrotum/labium, motor to the muscles of the urogenital triangle.
+<br/>6. S2 + 3 + 4 =&gt; Perineal branch of the pudendal nerve - sensory to the posterior 2/3 of the scrotum/labium, motor to the muscles of the urogenital triangle.