Abdominal muscles - posterior and anterolateral,
Together these muscles comprise the abdominal wall!
The abdomen’s front and sides of anterolateral muscles consist,
There are five of these muscles that we will need to list!
Deep to superficial, these are transversus abdominis,
Internal oblique, rectus abdominis, external oblique, pyramidalis!
There’s only one true posterior wall muscle - quadratus lumborum,
But four other muscles also join in on the fun!
Iliacus, psoas major, psoas minor, the diaphragm!
Now let’s review each abdominal muscle with this diagram!
There are two muscle groups on the anterolateral abdominal wall,
3 flat muscles are lateral, and two are vertical!
Flat muscles stack on each other, their fibers go different ways,
To strengthen the wall, and to prevent herniation, yay!
Here toward their medial aspect, a transition begins,
Into aponeuroses, which are broad and flat tendons.
The aponeuroses cover the rectus abdominis and they entwine.
To form the fibrous linea alba, a prominent vertical line!
The transversus abdominis compresses your bowels,
Transversely running fibers grant it these powers!
Next up is the internal oblique, supramedially its fibers go,
To unilaterally ipsilaterally rotate the torso!
When contracting bilaterally, it gives the abdomen a squeeze!
It’s thinner than the external oblique, so remember that please!
The most superficial flat muscle is the external oblique,
Its fibers run perpendicular to the internal oblique!
Running from ribs 5-12 it contralaterally rotates the torso,
It inserts into the iliac crest and pubic tubercle so you know!
Vertical muscles include rectus abdominis and pyramidalis,
Six packs result from tendinous intersections across rectus abdominis!
Along your midline the linea alba splits rectus abdominis,
This muscle’s lateral borders create the linea semilunaris!
Inferior to rectus abdominis, pyramidalis is known,
To attach to the linea alba and to the pubis bone!
Originating from the pubic symphysis and pubic crest,
This triangular muscle tenses linea alba on request!
The rectus sheath is formed by aponeuroses of the flat muscles three,
Enclosing rectus abdominis and pyramidalis, see!
Now onto the posterior abdominal wall, quadratus lumborum,
Iliacus, psoas major/minor, and the diaphragm.
Quadratus Lumborum’s fibers run in a supramedial direction,
Upon vertebrae it imposes extension and lateral flexion!
The Psoas Major is near the midline and it helps equip,
Lateral flexion of the vertebrae, and thigh flexion at the hip!
The psoas major originates from vertebrae T12-L5,
Running inferolaterally till at the femur it arrives!
The psoas minor causes vertebral column flexion,
Only half of people have this muscle, on inspection,
Iliopsoas forms when iliacus and psoas major are combined,
Iliopsoas is a major thigh flexor, keep that in mind!
It originates from the iliac fossa and the iliac spine,
Inserts on the femur, once with psoas major it’s combined!
The posterior of the diaphragm, the muscle making each breath start,
Connects to lumbar vertebrae and of the posterior abdomen is a part!
Fight Club - Muscles Map - Combo #3 by VideoMagus