Medial thigh muscles

Question 1

What are the attachments, actions and innervation of the adductor Magnus ?

Answer 1

• Largest muscle in the medial component of the thigh.
• Can be split into the adductor part and hamstring part
• Origin : Adductor part - inferior rami of pubis and rami of ischium. / hamstring part - ischial tuberosity
• Insert : Adductor part - linea aspera / hamstring part - adductor tubercle and medial supracondylar line.
• Actions : Both adduct the thigh / adductor part flexes thigh and hamstring part extends the thigh
• Innervation : adductor part obturator nerve L2-L4 and hamstring part tibial portion of the sciatic nerve L4-S3.

Question 2

What are the attachments, actions and innervation of the adductor longus ?

Answer 2

Origin : pubis
insertion : linea aspera
Actions : adduction of the thigh
Innervation : Obturator nerve (L2 - L4)

Question 3

What are the attachments, actions and innervation of the adductor brevis ?

Answer 3

• Origin : Body of the pubis and inferior rami
• Insert : Linear aspera proximal to adductor longus
• Action: Adduction of the thigh
• Innervation : obturator nerve (L2 -L4 )

Question 4

What are the attachments, actions and innervation of the obturator externus ?

Answer 4

• Origin : membrane of the obturator foramen and adjacent bones.
• Insert : posterior greater trochanter
• Actions : Adduction and lateral rotation of the thigh
• Innervation : Obturator nerve L2 - L4.

Question 5

What are the attachments, actions and innervation of the gracillus ?

Answer 5

• Origin : Inferior rami and body of rami
• insert : medial surface of the tibia
• Action : adduction at the thigh and flexion at the knee
• Innervation : Obturator nerve ( L2 - L4 )