COMP 2 Anatomy Muscles Innervations and actions

Quadratus Lumborum Attachments

Iliac Crest, Iliolumbar Ligament, Rib 12

Quadratus Lumborum Actions

Extends and laterally flexes vertebral column/trunk, stabilizes 12th rib during inspiration

What innervates the Quadratus lumborum?

Subcostal Nerve, anterior rami of spinal nerve

Quadratus Lumborum Blood supply

Subcostal Artery, Lumbar artery, Iliolumbar artery

Psoas major muscle attachments

VB T12-L5, TP of L1-L5, lesser trochanter of femur

Psoas Major Muscle (Function):

Laterally flexes vertebral column (superiorly) and acts with iliacus to flex thigh

Psoas Major Innervation

anterior rami of L1-L3 spinal nn.

Psoas Major Blood Supply

Iliolumbar artery

Psoas minor attachments

Vertebral Bodies T12-L1, Iliopubic eminence and pecten pubis

“Twelve-Little-Ilio-Pecs”

Breakdown:

• Twelve → T12

• Little → L1

• Ilio → Iliopubic eminence

• Pecs → Pecten pubis

Psoas Minor Functions

Weakly flexes trunk

Psoas Minor Innervation

Ventral ramus of L1 spinal n.

Psoas Minor Blood Supply

Lumbar Artery

Iliacus Attachments

Iliac fossa (sup. 2/3), ala of sacrum, anterior sacroiliac ligament, lesser trochanter of femur

Mnemonic: “I SAT”

• I – Iliac fossa (superior 2/3)

• S – Sacrum (ala of sacrum)

• A – Anterior sacroiliac ligament

• T – Trochanter (lesser trochanter of femur)

Iliacus Functions

Flexes thigh, stabilizes hip joint

Iliacus Innervation

Femoral Nerve

Iliacus blood supply

Medial Circumflex artery, femoral artery, iliolumbar artery

Transversus Abdominis Muscle Attachments

Costal cartilages ribs 7-12, thoracolumbar fascia, iliac crest, iliopectineal arch, linea alba, aponeurosis of internal abdominal oblique muscle, pubic crest, pectineal line of pubis

Transversus Abdominis Muscle Functions

Aids in expiration, ipsilaterally rotates trunk, supports abdominal viscera

Transversus Abdominis Muscle Innervation

- Ventral rami of T7-T11 spinal nn.

- Subcostal n. (T12)

- 1st lumbar n.

Transversus Abdominis Muscle Blood Supply

- Lower posterior intercostal aa.

- Subcostal a.

- Superior epigastric a.

- Inferior epigastric a.

Diaphragm Attachments

Xiphoid Process, costal cartilages ribs 7-12, arcuate ligament, anterior longitudinal ligament, central tendon of diaphragm

Diaphragm Blood Supply

Superior Phrenic Artery

Inferior Phrenic Artery

Pericardiophrenic Artery

Musculophrenic Artery

Subcostal Artery

The major duodenal papilla serves

as the common opening for the common bile duct and main pancreatic duct

Minor duodenal papilla function (do not need to identify 🙂 )

drains the accessory pancreatic duct

Levator ani Attachments

Body of Pubis, tendinous arch, ischial spine, perineal body, coccyx, anococcygeal ligament

Mnemonic: “Aye (I)!!! Pussy Tight, Asshole Clenches Perfectly.”

•  I → Ischial Spine

• P → Pubic bone body

• T → Tendinous arch of obturator internus fascia

• A → Anococcygeal ligament

• C → Coccyx

• P → Perineal body

Levator Ani functions

Supports pelvic viscera and forms most of pelvic diaphragm

Levator Ani Innervation

- N. to levator ani (S4)

-Inferior rectal n.

- Coccygeal plexus

Levator Ani Blood Supply

- Inferior gluteal a.

- Inferior vesical a.

- Internal pudendal a.

Coccygeus Muscle Attachments

Ischial Spine, Inferior aspect of sacrum and coccyx

Coccygeus Muscle Functions:

Flexes coccyx and supports pelvic viscera

Coccygeus Muscle Innervation

- N. to levator ani (S4)

- Inferior rectal n.

- Coccygeal plexus

Shares Same innervation as Levator Ani

Coccygeus Muscle Blood Supply

- Inferior gluteal a.

- Inferior vesical a.

- Internal pudendal a.

Obturator Internus Attachments:

Obturator membrane, obturator foramen, greater trochanter of femur

Obturator Internus Functions

Externally rotates extended thigh and abducts flexed thigh

Obturator Internus Innervation

N. to obturator internus

Obturator Internus Blood Supply

Obturator Artery and internal Pudendal Artery

Rectus femoris attaches to the

AIIS and the Quadriceps Tendon

Rectus Femoris Functions:

Extends leg, flexes thigh, steadies hip joint.

Rectus Femoris Innervation

Femoral Nerve

Rectus Femoris Blood Supply

- Femoral a.

- Deep femoral a.

- Lateral circumflex femoral a.

Sartorius Muscle Attachments

Anterior Superior Iliac Spine, Proximal Tibia

SART is a bad guy.  Beats SAP
Flexes on them, abducts them, and has ... with them

Sartorius Muscle Function:

SART is a bad guy.  Beats SAP
Flexes on them, abducts them, and has ... with them, and does them in.

- Adducts thigh

- Flexes thigh

- Assists in internal & external rotation of thigh

Sartorius Innervation

Femoral Nerve

Sartorius Muscle Blood Supply

- Femoral a.

- Profunda Femoris a.

- Lateral circumflex femoral a.

Iliopsoas Muscle Attachments

Iliac Fossa, Anterior Sacroiliac ligament, ala of sacrum, lesser trochanter

I AM A LOON

Iliopsoas Muscle Functions

Great Thigh/hip Flexor

Iliopsoas Muscle Innervation

Iliacus: - Femoral n.

Psoas major: - Ventral rami of L1-L3

Iliopsoas Blood Supply

- External iliac a.

- Femoral a.

- Iliolumbar a.

- Obturator a.

Vastus Lateralis Muscle Attachments

- Greater trochanter of femur

- Linea aspera

- Quadriceps Tendon

Rectus Femoris Muscle Functions

- Extends leg

- Flexes thigh

- Steadies hip joint

Vastus Lateralis Muscle Innervation

Femoral Nerve

Rectus Femoris Muscle Blood Supply

- Femoral a.

- Deep femoral a.

- Lateral circumflex femoral a.

Vastus Lateralis Muscle Functions:

Extends Thigh

Vastus Lateralis Muscle Innervation

Femoral Nerve

Vastus Lateralis Muscle Blood Supply

- Lateral circumflex femoral a.

- Deep femoral a.

Vastus Intermedius Muscle Blood Supply

- Lateral circumflex femoral a.

- Deep femoral a.

Vastus Intermedius Muscle Attachments

Shaft of femur, Quadriceps Tendon

Vastus Intermedius Muscle Functions

Extends leg

Vastus Intermedius Muscle Innervation

Femoral Nerve

Vastus Medialis Muscle Attachments

Intertrochanteric line, linea aspera, Quadriceps Tendon

Vastus Medialis Muscle Functions

Extends Leg

Vastus Medialis Muscle Innervation

Femoral Nerve

Vastus Medialis Muscle Blood Supply

- Femoral a.

- Profunda Femoris a.

- Descending genicular a.

Gracilis Muscle Attachments

Inferior Pubic Rami, Body of Pubis, Proximal Tibia

Gracilis Functions

- Adducts thigh

- Flexes leg

- Internally rotates leg (tibia) at knee

Part of Medial Thigh

Gracilis Muscle Innervation

Obturator Nerve

Gracilis Muscle Blood Supply

Deep Femoral Artery

Tensor Fasciae Latae Attachments

ASIS and Iliotibial Tract

Tensor Fasciae Latae Functions

Abducts and Internally rotates thigh

Tensor Fasciae Latae Innervation

Superior Gluteal Nerve

Tensor Fasciae Latae Blood Supply

- Lateral circumflex femoral a.

- Superior gluteal a.

Gluteus Medius Attachments

Greater Trochanter, ilium

Gluteus Medius Functions

Abducts and Internally rotates thigh

Gluteus Medius Innervation

Superior Gluteal Nerve

Gluteus Medius Blood Supply

Superior Gluteal Artery

Pectineus Muscle Attachments

Superior Pubic Ramus, pectineal lin

Pectineus Muscle Functions

Adducts, flexes, and assists in internal/external rotation of thigh

Pectineus Muscle Innervation

Femoral Nerve

Pectineus Muscle Blood Supply

Medial Femoral Circumflex A., Obturator Artery

Adductor longus Attachments

Body of Pubis, linea aspera

Adductor longus functions

adducts thigh

Adductor longus Blood Supply

- Profunda femoris a.

- Obturator a.

- Medial circumflex femoral aa

Adductor Brevis Attachments

Body of pubis, inferior ramus of pubis, pectineal line, linea aspera, 

Adductor Brevis Functions

Adducts Thigh

Adductor Brevis Blood Supply

Profunda Femoris A.

Adductor magnus (only) Attachments

Inferior ramus of Pubis, Gluteal Tuberosity, Linea Aspera, Medial Supracondylar line, 

Adductor magnus (only) Functions

Adducts, Flexes thigh

Adductor magnus (only) Innervation

Obturator Nerve

Adductor magnus (adductor + hamstring part) Blood Supply

- Profunda femoris a.

- Femoral a.

- Popliteal a.

- Genicular aa.

Adductor magnus Hamstring Attachments

Ischial Tuberosity and adductor tubercle

Adductor magnus Hamstring functions

Extends Thigh

Adductor magnus Hamstring Innervation

Tibial Nerve

Gluteus Maximus Attachments

Ilium, Sacrum, gluteal tuberosity, iliotibial tract, sacrotuberous ligament

Gluteus Maximus Functions

Extends, externally rotates thigh. Rises from sitting position

Gluteus Maximus Innervation

Inferior Gluteal Nerve

Gluteus Maximus Blood Supply

Superior gluteal artery and inferior gluteal artery

Gluteus minimus Attachments

Ilium, greater trochanter

Gluteus minimus functions

Abducts, Internally Rotates Thigh

Gluteus minimus Innervation

Superior Gluteal Nerve

Gluteus minimus Blood Supply

Superior Gluteal Artery