Muscles unit III Flashcards
Iliacus attachments
O: iliac fossa, sacrum
I: lesser trochanter of femur
Poas major attachments
O: Bodies and transverse processes of lumbar vertebrae
I: lesser trochanter
Actions of the iliopsoas
Flexion at hip, flexion of spinal column, maintain posture.
Innervation of the iliopsoas
Femoral nerve (L2-4)
What percentage of the population has a Psoas minor muscle?
About 50%
Attachments of the Psoas minor
O: bodies of lumbar vertebrae
I: iliopubic eminence
Action of the Psoas minor
Flex pubic bone
Innervation of the Psoas minor
L1
Attachments of the sartorius
O: asis
I: superior medial shaft of tibia
Actions of the sartorius
Flex hip and knee at the same time, abduct and laterally rotate femur, medially rotate leg
Innervation of the sartorius
Femoral nerve
Quadriceps muscles
Rectus femoris, vastus medialis, vastus lateralis, vastus intermedius
Insertion of the quadriceps muscles
Base of the patella
Origin of the rectus femoris
AIIS, acetabulum
Origin of vastus lateralis
Greater trochanter and linea aspera
Origin of the vastus medialis
Linea aspera
Origin of vastus intermedius
Anterior-lateral aspect of femur and linea aspera
Fibers sometimes separate from vastus intermedius to form what muscle? Where does that muscle insert?
Articularis genu, synovial membrane of the knee joint
Action of the articularis genu
Retract synovial membrane to stabilize knee joint
Action of all quadriceps muscles
Extend knee joint, strengthen knee joint
Action of rectus femoris only
Flex femur at hip joint
What is a cramp or spasm of the quadriceps called?
Charley Horse
What is an overuse injury of the quadriceps tendon of insertion and/or the patellar ligament called?
Jumper’s knee
Which spinal nerves are tested during a patellar reflex test?
L2-L4
Which muscles are part of the adductor group?
Gracilis, pectineus, adductor longus, adductor brevis, and adductor magnus
The adductor group muscles are innervated by which nerve?
The obturator nerve
Attachments of gracilis
O: Ramus of ischium, inferior ramus of pubis
I: superior medial shaft of tibia.
Actions of gracilis
Flex leg, adduct femur
What surgical procedure is the gracilis involved in?
It is often transplanted to replace a damaged muscle
Attachments of pectineus
O: superior ramus
I: pectineal line
Actions of the pectineus
Adduct femur, flex hip
Innervation of pectineus
Femoral and obturator nerves
Attachments of adductor magnus
O: rami of pubis and ischium
I: linea aspera, adductor tubercle
Actions of adductor magnus
Adduct femur, extend femur at hip
Innervation of adductor magnus
Obturator and sciatic nerve
Attachments of adductor longus
O: Superior ramus of pubis
I: linea aspera
Attachments of adductor brevis
O: inferior ramus of pubis
I: pectineal line, linea aspera
Attachments of tensor fascia lata
O: crest of ilium
I: iliotibial tract
Actions of the tensor fascia lata
Flex, abduct, medially rotate femur, stabilize knee
Innervation of the tensor fascia lata
Superior gluteal nerve
Attachments of Gluteus maximus
I: posterior gluteal line, sacrum and coccyx, posterior ligaments of SI joint
O: gluteal tuberosity, iliotibial tract
Actions of Gluteus maximus
Extend and laterally rotate femur, stabilize knee and pelvic bone
Innervation of Gluteus maximus
Inferior gluteal nerve
