muscles Flashcards
rectus abdominus origin
lateral head: crest of pubis, pubic tubercle
Medial head: anterior region of pubic symphysis
rectus abdominus insertion
costal cartilage ribs 5-7
xiphoid process of sternum
rectus abdominus innervation
intercostal n T5-T12
rectus abdominus action
flexes trunk
compresses abdomen
stabilizes pelvis
anterolateral abdominal wall muscles
external and internal obliques
transversus abdominus
external oblique origin
ribs 5-12
external oblique insertion
linea alba
pubic tubercle
anterior iliac crest
external oblique innervation
intercostal n. T7-T12
external oblique action
unilateral- lateral trunk flexion
contralateral trunk rotation
bilateral- flex trunk, compress abdomen, stabilizes pelvis
internal obliques origin
deep thoracolumbar fascia, iliac crest, anterior superior iliac spine,
iliopsoas fascia
internal obliques insertion
10-12 ribs (lower border)
linea alba
internal obliques innervation
intercostal n. T7-T12
iliohypogastric n.
ilioinguinal n.
internal obliques action
unilateral- lateral trunk flexion, contralateral rotation
bilateral-trunk flexion, compress abdomen, stabilizes pelvis
transversus abdominus origin
costal cartilage ribs 7-12 (inner surfaces)
deep thoracolumbar fascia, iliac crest,
anterior iliac spine, iliopsoas fascia
transversus abdominus insertion
linea alba
pubic crest
transversus abdominus innervation
intercostal n. T7-T12
iliohypogastric n.
ilioinguinal n.
rectus abdominus action
unilateral- ipsilateral rotation
bilateral- compress abdomen
posterior abdominal wall muscles
psoas major and minor
illiacus
quadratus lumborum
psoas major origin
superficial- T12-L4 vertebral bodies, IV disks (lateral)
deep layer- L1-L5 costal processes
psoas major insertion
lesser trochanter of femur
joint insertion as iliopsoas muscle
psoas major innervation
lumbar plexus
L2-L4
psoas major action
flexion and external rotation of hip joint
lateral flex trunk
bilaterally flex trunk (sit up from supine)
psoas minor origin
T12-L1 vertebrae and IV disks (lateral)
psoas minor insertion
pectin pubis
iliopubic ramus
iliac fascia
Psoas minor innervation
lumbar plexus
L2-L4
psoas minor action
weak trunk flexor
iliacus
O: iliac fossa
I: (as iliopsoas muscle) (lesser trochanter of humerus)
Femoral n. L2-L4
quadratus lumborum origin
Iliac crest
iliolumbar ligament
quadratus lumborum innsertion
12th rib
L1-L4 TP
quadratus lumborum innervation
T12, L1-L4 spinal n.
quadratus lumborum action
unilateral- ipsilateral lateral flexion
bilateral- bearing down, expiration, stabilizes 12th rib
anterior abdominal wall muscles
rectus abdominus
external intercostals
inferior border of rib to superior border of inferior rib fibers run anterioinferiorly *intercostal nerves 1-11 *inspiration *stabilize chest wall
internal intercostal
inferior border of rib to superior border of inferior rib fibers run anterior and superior *intercostal nerves 1-11 *expiration *stabilize chest wall
transversus thoracis origin
sternum and xiphoid process
transversus thoracis insertion
costal cartilage of ribs 2-6
transversus thoracis innervation
intercostal nerves 2-6
transversus thoracis action
weakly lowers ribs
expiration
pelvic diaphragm
levator ani
coccygeus
pelvic fascia
levator ani origin
body of pubis
tendinous arch
ischial spine
levator ani insertion
coccyx perineal body anococcygeal ligament prostate/vagina rectum anal canal
levator ani innervation
sacral plexus S4
inferior anal nerve
coccygeal plexus
levator ani action
support pelvic viscera
coccygeus origin
sacrum
coccygeus insertion
ischial spine
coccygeus innervation
sacral plexus S4-S5
coccygeus action
support pelvic viscera
flex coccyx
piriformis origin
sacrum
piriformis insertion
greater trochanter of femur
piriformis innervation
sacral plexus S1-S2
piriformis action
external rotation and abduction of hip
obturator internus origin
tendinous arch
bony surroundings
obturator internus insertion
greater trochanter of femur
obturator internus innervation
sacral plexus L5, S1
obturator internus action
external rotation, abduction of hip joint
superficial transverse perineal O/I
ischial ramus - perineal body
superficial transverse perineal
innervation /action
pudendal n.
S2, S3, S4
- closes urethra
- holds pelvic organs in place
external anal sphincter O/I
encircles anus from perineal body to anococcygeal ligament
external anal sphincter action/ innervation
close anus
pudendal n S2-S4
ischocavernosus O:I
O: ishial ramus
I:crus of clitoris/penis
ischiocavernousus action/ innervation
pudendal n S2-S4
maintains erection
bulbospongiosus
perineal body to clitoris/penis
- pudendal n. S2-S4
- compress vestibular gland/ assist in erection
masseter O/I
o:zygomatic arch
I:mandibular angle
masseter innervated / action
mandibular n (CN V3) -elevates and protrudes mandible
Temporalis O/I
temporal fossa to coronoid process of mandible
temporalis innervation/action
mandibular n ( CN V3) -elevate, retract, lateral move mandible
lateral pterygoid superior head O/I
greater wing of sphenoid to TMJ articular disk
lateral pterygoid inferior head O/I
lateral pterygoid plate to condylar process of mandible
lateral pterygoid innervation/action
mandibular n. (CN V3)
-protrudes mandible
medial pterygoid O/I
maxilla and lateral pterygoid plate to pterygoid tuberosity of mandibular angle
medial pterygoid innervation/action
mandibular n (CN V3) -elevates mandible
digastric anterior belly
mandible to hyoid bone
- elevates hyoid bone
- mylohyoid n (CN V3)
digastric posterior belly
mastoid notch of temp bone to hyoid bone
elevates hyoid bone
facial n CN XI
stylohyoid
styloid process temp bone to hyoid bone
facial n CN XI
elevates hyoid bone
mylohyoid
mylohyoid line of mandible to hyoid bone
mylohyoid n CN V3
-mastication
geniohyoid
inferior mental spine of mandible to hyoid bone
- anterior ramus hypoglossal n (CN XII)
- draws hyoid forward, opens mandible
omohyoid
superior border of scap to hyoid bone
- ansa cervicalis C1-C3
- depress hyoid and larynx
sternohyoid
manubrium and SC joint to hyoid bone
- ansa cervicalis C1-C3
- depress hyoid and larynx
sternothyroid
manubrium to thyroid cartilage
- ansa cervicalis C2,C3
- depress hyoid and larynx
thyrohoid
thyroid cartilage to hyoid bone
C1 hypoglossal n ( CN XII)
-depresses and fixes hyoid
-raises larynx
