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Anatomy Exam IV > Muscle O/I/N and nerves > Flashcards

Muscle O/I/N and nerves Flashcards

1
Q

External Oblique

A

O: External Rib surfaces of 5-12
I: Linea Alba, pubic tubercle, ant. 1/2 iliac crest
N: Anterior Rami of T7-T11 (thoracoabdominal nerves) and subcostal nerve

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2
Q

Internal Oblique

A

O: Thoracolumbar Fascia, ant. 2/3 iliac crest, connective tissue deep to inguinal ligament
I: Inf. borders ribs 10-12, linea alba, pubis via conjoin tendon
N: Thoracoabdominal nerves (T7-T11 ant. rami) and first lumbar nerve (L1)

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3
Q

Transversus Abdominus

A

O: Internal surface ribs 7-12 costal cartilage, thoracolumbar fascia, iliac crest, connective tissue deep to inguinal ligament
I: Linea alba w/ aponeurosis of int. oblique, pubic crest, pectin pubis via conjoin tendon
N: Thoracoabdominal nerves (T7-T11) and first lumbar nerve (L1)

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4
Q

Rectus Abdominus

A

O: Pubic symphysis and pubic crest
I: Xiphoid Process and costal cartilage or 5-7
N: Thoracoabdominal nerves (Ant. rami of inf. 6 thoracic nerves)

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5
Q

Parietal Peritoneum Innervation

A

Somatic body wall nerves

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6
Q

Thoracoabdominal nerves

A

T7-T11. Continuation of lower intercostals. Run b/w 2nd and 3rd muscular layers. Lat and ant cutaneous branches enter subcutaneous tissue.
Innervate muscles of anterolateral wall and skin

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7
Q

Subcostal nerve

A

Ant ramus of T12.

Innervates anterolateral abdominal wall and overlying skin superior to iliac crest and umbilicus

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8
Q

Iliohypogastric nerve

A

L1.
Innervates skin overlying iliac crest, upper inguinal and hypogastric regions, internal oblique and transversus abdominus

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9
Q

Ilioinguinal nerve

A

L1. Passes b/w 2nd and 3rd muscular layers, then traverses inguinal canal
Innervates skin of scrotum/ labia majus and mons pubis, adjacent medial aspect of thigh, inferior most internal oblique and transversus abdominus

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10
Q

Pyramidalis Muscle

A

O: Pubic crest/symphysis
I: Linea alba
N: Subcostal (T12)
Tenses linea alba

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11
Q

Cremaster Muscle

A

N: Genital branch of genitofemoral

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12
Q

Dartos Muscle

A

N: Genital branch of genitofemoral nerve (L1-2)

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13
Q

Foregut innervation

A

Symp: T5-9 (symp chain ->greater splanchnic ->synapse in celiac ganglion -> follow celiac trunks to target organ)
Parasymp: Vagus (vagus -> through celiac plexus -> follow celiac trunks ->synapse in ganglia of gut plexuses -> short post synaptic to target organs)

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14
Q

Midgut innervation

A

Symp: T10-12 (symp chain -> lesser(T10-11)/least(T12) splanchnic -> synapse in SMA ganglion-> follow SMA trunks to target organs)
Parasymp: Vagus (vagus-> through SMA plexus->follow SMA trunks->synapse in ganglia of gut plexuses->short post synaptic to target organs)

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15
Q

Hindgut innervation

A

Symp: L1-L2 (symp trunk->lumbar splanchnic nerves (L1-L2)->synapse in IMA ganglion->post synaptic to target organs following IMA trunks
Parasymp: S2-S4 (Sacral spinal nerves S2-4 -> pelvic splanchnic -> through hypogastric and IMA plexuses -> follow branches of IMA to target -> synapse in ganglia in gut plexuses -> short post synaptic to target organs

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16
Q

Psoas Muscle

A

O:Trans processes of lumbar vert, sides of vertebral bodies and discs T12-S1
I: Lesser trochanter of femur
N: Lumbar plexus direct branches L2-4

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17
Q

Iliacus

A

O: Superior 2/3 of iliac fossa, ala of sacrum, anterior sacro-iliac ligamens
I: Lesser trochanter of femur and shaft inferior to it
N: Femoral nerve (L2-L4)

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18
Q

Quadratus Lumborum

A

O: Medial half of inf. border of 12th rib and tips of lumber transverse processes
I: iliolumbar ligament and internal lip of iliac crest
N: Ant branches of T12 and L1-4

19
Q

Subcostal Nerve

A

O: ventral rami of T12
N: External oblique muscle and skin of anterolateral abdo wall

20
Q

Lumbar spinal nerves

A

O: L1-5
N: [post rami] deep back muscles, skin of back [ant rami] skin and muscles of the most inferior trunk and lower limb

21
Q

Lumbar Plexus

A

O: L1-4
Gives rise to: Ilioinguinal, iliohypogastric, genitofemoral, lateral femoral cutaneous, femoral nerve, Obturator nerve, accessory obturator nerve, lumbosacral trunk

22
Q

Ilioinguinal and iliohypogastric nerves

A

O: L1
N: abdominal muscles an skin of inguinal and pubic regions

23
Q

Genitofemoral nerve

A

O: L1-2(divides into genital and femoral branches)
N: Skin below inguinal ligament. Gen. branch innervates cremaster. Femoral branch innerv. skin under medial inguinal lig

24
Q

Lateral femoral cutaneous nerve

A

O: L2-3

N anterolateral skin of thigh

25
Q

Femoral nerve

A

O: L2-4
N: iliacus, hip flexors, knee extensors

26
Q

Obturator nerve

A

O: L2-4
N: medial thigh and adductors

27
Q

Accessory obturator nerve (usually not present)

A

O: L3-4
N: pectineus, hip joint

28
Q

Lumbosacral Trunk

A

O: L4-5
I: Joins sacral plexus

29
Q

Obturator internus

A

O: Obturator membrane and bony boundaries
I: Medial part of greater trochanter
N: Direct branches of sacral plexus (L5-S1)

30
Q

Piriformis

A

O:Anterior sacrum
I: Apex of greater trochanter
N: Direct branches of sacral plexus (S1-S2)

31
Q

Pelvic diaphragm

A

Levator ani (puborectalis, pubococcygeus, iliococcygeus) + coccygeus

32
Q

Coccygeus aka ischiococcygeus

A

O: Sacrum
I: Ischial Spine
N: Direct branches from sacral plexus (S4-S5)

33
Q

Levator ani

A

Pubococcygeus, puborectalis, iliococcygeus

34
Q

Puborectalis

A

O: Sup. Pubic ramus bilaterally
I: Anococcygeal ligament
N: Direct from sacral plexus (S4) and inf. anal nerve

35
Q

Pubococcygeus

A

O: Pubis, lateral to origin of puborectalis
I: Anococcygeal ligament, coccyx
N: Direct from sacral plexus (S4) and inf. anal nerve

36
Q

Iliococcygeus

A

O: Internal obturator fascia of levator ani (tendinous arch)
I: Anococcygeal ligament, coccyx
N: Direct from sacral plexus (S4) and inf. anal nerve

37
Q

Sciatic nerve

A

ant and post div. of Sacral plexus (L4-S3)

N: Lower limb. Travels through grater sciatic foramen

38
Q

Pudendal nerve

A

ant. div. of Sacral plexus (S2-S4)
N: skin and muscles of perineum, main sensory for external genitalia. Exits through greater sciatic foramen, enters perineum via lesser sciatic foramen

39
Q

Superior gluteal nerve

A

post div. of Sacral Plexus (L4-S1)

N: Gluteus medius, minimus, tensor fascia latae. Exits via greater sciatic foramen

40
Q

Inferior gluteal nerve

A

post div of Sacral Plexus (L5-S2)

N: gluteus maximus

41
Q

Dartos muscle

A

N: genital branch of genitofemoral

42
Q

Sexual Function (nerves)

A

Erection: Parasymp. S2-4 splanchnics
Emission: Symp. L1-2 splanchnics
Ejaculation: Somatic (some autonomic) pudendal nerve (S2-4) Autonomics: symp-close int. sphincter, parasymp, contract urethral muscle

43
Q

External urethral sphincter

A

Perineal branch of pudendal

Anatomy Exam IV (1 decks)

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