Muscles Flashcards
What is the insertion and origin of pectoralis major?
Insertion: -Inter-tubercular groove of humerus Origin: -Anterior surface of the medial half of the clavicle -Anterior surface of sternum -Aponeurosis of external obliques -Superior six costal cartilages
Name the anterior shoulder muscles
Pectoralis major
Pectoralis minor
Subclavius
Serratus anterior
What are the actions of pectoralis major?
Medial rotation, adduction, extension and flexion of humerus
Draws scapula anteriorly and inferiorly
What is the innervation of pectoralis major?
Medial and lateral pectoral nerves (from the medial and lateral cords)
c5, C6, C7, C8, T1
What is the insertion and origin of pectoralis minor?
Insertion:
-Coracoid process of scapula
Origin:
-3rd to 5th ribs, near their costal cartilages
What are the actions of pectoralis minor?
Stabilises scapula by drawing it anteriorly and inferiorly
What is the innervation of pectoralis minor?
The medial pectoral nerve (C8, T1)
Describe the pectineus
Anterior thigh
From the superior pubic ramus to the pectineal line of the femur
Innervated by the femoral nerve (L2,3)
Adduction and flexion of the thigh. Some medial rotation
Describe iliopsoas
Anterior thigh
Made up of iliacus, pass major and psoas minor
Describe iliacus
Anterior thigh
From the iliac fossa to the lesser trochanter of the femur
Flexion and stability of the hip joint
Innervated by the femoral nerve (L2,3)
Describe psoas major
Anterior thigh
From T12-L5 vertebrae (sides, discs and transverse processes) to the lesser trochanter of the femur
Flexion and stability of the hip joint
Innervated by the anterior rami of the lumbar nerves (L1,2,3)
Describe psoas minor
Anterior thigh
From the sides and discs of the T12-L1 vertebrae to the pectineal line
Flexion and stability of the hip joint
Innervated by the anterior rami of the lumbar nerves (L1,2)
Describe sartorius
Anterior thigh
From the ASIS to the superior medial tibia
Innervated by the femoral nerve (L2,3)
