Pectoral region + muscle insertions Flashcards
What are the three origins of the pectoralis major and draw them
clavicular head (medial healf of clavicle and anterior surface of sternum), abdominal head (aponeuroses of external oblique) and sternocostal head (first seven costal cartilages)
what structure separates the deltoid from the pectoralis major
cephalic vein
what are the names of the two other muscles below the pectoralis major
pectoralis minor and serratus anterior
what are the functions of the anterior abdominal walls
protect viscera, assist in breathing, coughing, vomiting, defacation, urination and birth
why are surgical incisions usually made along the linea alba
because this is where aponeuroses join so there will be less bleedinggg as they have less blood supply and fewer nerves. however, it will scar and there is the potential of hernias
state the origin of the external oblique muscle
ribs 5-12
state the innervation of the external oblique muscle
anterior rami of T7-T12
state the insertion of the external oblique muscle
linea alba and the lateral lip of the ileac crest
state the origin of the internal obliques
iliac crest, lateral 2/3 of the inguinal ligament and thoracolumbar fascia
state the origin of the rectus abdominis
pubic symphysis, crest and tubercle
state the origin of the transversus abdominis
lip of iliac crest, lateral 1/3 of inguinal ligament, thoracolumbar fascia and costal cartilage of ribs 7-12
state the difference in structure of the anterior abdominal walls superior and inferior to the arcuate line
superior = external oblique, internal oblique runs both anterior and posterior to the rectus abdominis, transversus abdominis, transversalis facia
inferior = external oblique, internal oblique, transversus abdominis rectus abdominis, transversalis fascia
what is contained in the rectus sheath
rectus abdominis, superior and inferior epigastric vessels, thoracoabdominal nerves
state the function of the external oblique muscle
flex trunk, bend trunk to the side, compress abdominal contents
state the insertion of the internal obliques
inferior border of ribs 9-12, aponeuroses ending in the linea alba, pubic crest
state the innervation of the internal obliques
anterior rami of T7-T12 and L1
state the function of the internal obliques
compress abdominal contents, flex trunk and bends trunk
state the insertion of the rectus abdominis
xiphoid process and costal cartilage of ribs 5-7
state the innervation of the rectus abdominis
anterior rami of T7-T12
state the function of rectus abdominis
compress abdominal contents, flex vertebral column
state the insertion of transversus abdominis
linea alba and pubic crest
state the innervation of transversus abdominis
anterior rami of T7-T12 and L1
state the function of transversus abdominis
compress abdominal contents
state the origin of pyramidalis
front of pubis and pubic symphysis
state the insertion of pyramidalis
linea alba
state the innervation of pyramidalis
anterior ramus of T12
state the function of pyramidalis
tenses the linea alba
state the insertion of pectoralis major
lateral lip of intertubercular sulcus of humerous
state the innervation of pectoralis major
medial and lateral pectoral nerves
state the function of pectoralis major
adduction, medial rotation, flexion of the humerous at the shoulder joint
state the origin of pectoralis minor
anterior surface of ribs 3,4 and 5 and the deep fascia overlying the intercostal spaces
state the insertion of pectoralis minor
coracoid process of scapula
state the innervation of pectoralis minor
medial pectoral nerves
state the function of pectoralis minor
depresses tip of shoulder and protects scapula
state the origin of serratus anterior
anterior surface of ribs 1-8/9
state the insertion of serratus anterior
anterior surface of the medial border of the scapula
state the innervation of serratus anterior
C5,6,7 - branch of the brachial plexus
state the function of the serratus anterior
protracts and stabilises scapula. rotates scapula upwards
