Rectus abdominis: This pair of muscles goes down the middle of your abdomen from your ribs to the front of your pelvis. The muscles hold your internal organs in place and keep your body stable during movement. The rectus abdominis may form bumps sometimes called a “six-pack” when someone has a trim, fit abdomen.
What is the action of the abdominal muscle?
The abdominal muscles support the trunk, allow movement, hold organs in place, and are distensible (being able accommodate dynamic changes in the volume of abdominal contents).
What is the action of the rectus abdominis muscle quizlet?
The rectus abdominis flexes the vertebral column in addition to compressing the abdominal wall. The other abdominal muscles compress the abdominal wall and laterally rotate the trunk.
What action does the rectus femoris perform?
Thus the rectus femoris received its name because it runs straight down the thigh. It is a two way acting muscle as it crosses over the hip and knee joint; therefore, it functions to extend the knee and also assists iliopsoas in hip flexion. It is thus also a hip flexor.
What are the 4 layers of abdominal muscles?
These muscles of the anterolateral abdominal wall can be divided into four groups: the external obliques, the internal obliques, the transversus abdominis, and the rectus abdominis (Figure 16.16 and Table 16.6).
What rectus means?
Definition of rectus
: any of several straight muscles (as of the abdomen)
Is rectus abdominis deep or superficial?
However, trunk muscles are classified into 2 groups; superficial muscles that are part of the global muscle system and include the rectus abdominis (RA) and the external oblique (EO), and deep muscles that are part of the local muscle system and include the transverses abdominis (TrA), the multifidus and the internal
What plane of motion does the rectus abdominis function in?
Function. The main actions for rectus abdominis are: Flexion of the trunk (flexion of thoracic and lumber spine), while it works by drawing pubic symphysis and sternum toward each other.
Is the rectus abdominis anterior or posterior?
The rectus sheath has an anterior and posterior wall. The walls are composed of a fusion of the aponeuroses of the external abdominal oblique, internal abdominal oblique, and transversus abdominis muscles.
Does the rectus abdominis compress the abdomen?
The rectus abdominis muscles are a pair of long muscles that run vertically up the front of the abdomen, stretching from the pubis to the xiphoid process. They compress the viscera and tense the abdominal wall.
How does the action of the rectus abdominis differ from that of the other abdominal muscles quizlet?
How does the action of the rectus abdominis differ from that of the other abdominal muscles? They all compress the abdominal wall but the rectus abdominis does NOT laterally rotate the trunk but DOES flex the vertbral column. What is the action of the serratus anterior muscle? Abducts scapula from the spinal column.
How does the action of the rectus femoris differ?
The action of the rectus femoris differs from those of the other quadriceps muscles because it participates in flexion at the hip.
What is the origin of the rectus abdominis muscle quizlet?
Origin: pubic crest; pubic symphysis. Insertion: xiphoid process; costal cartilages of ribs 5-7. Action: flexion of vertebral column; stabilizes pelvis during walking; increases intraabdominal pressure during forced expiration. Innervation: thoraco-abdominal nerves (anterior rami of T7-T11) and subcostal nerve.
Why is the rectus femoris important?
A muscle in the quadriceps, the rectus femoris muscle is attached to the hip and helps to extend or raise the knee. This muscle is also used to flex the thigh. The rectus femoris is the only muscle that can flex the hip.
What is an action of the rectus femoris muscle quizlet?
Rectus femoris action. Extends knee and flexes thigh at hip.
What Innervates rectus femoris?
The entire quadriceps femoris muscle is innervated by the femoral nerve (L2-L4).
