Class Notes (839,460)
Canada (511,348)
Health Sciences (2,117)

LEC 6D Muscles of the Pelvic Girdle and Lower Limbs.docx

7 Pages

Health Sciences
Course Code
Health Sciences 2300A/B
Jamie Melling

This preview shows pages 1 and half of page 2. Sign up to view the full 7 pages of the document.
The Muscular System: Muscles of the Pelvic Girdle and Lower Limbs November-15-12 2:47 PM 5 Muscle Groups of Pelvis  5 different groups, in picture only 4 is seen, one is big enough to be separated into 2 subgroups  Nerves that innervate come from lumbar or sacral plexuses  2 main nerves in lumbar region femoral and Obtruator nerve (runs through obturator foramen)  Femoral- large nerve anterior in the thigh  Superior gluteal nerve and anterior nerve  Sciatic nerve- like an extension cord, and as thick  Sciatica – continuous pressure placed in this nerve because it is so big, structures it innervates begin to tingle and get sore  “Common”- further braches to come, common artery that will branch into further arteries The Femur  Vastus intermedius- originates off the anterior femur  Very few insertion points on the anterior femur , few attachments  On the posterior side very different- lots of attachments  Assign an origin for a muscle on pelvis or femur, move towards insertion point you need to consider where it attaches on femur, what the muscle will do  Originate from anterior pelvis to posterior femur- causes rotational movement on the femur The Illiopsoas  Also called the “hip flexor group”  Psoas- two muscles - major and minor  Primary muscle is the illiopsoas- made up of two muscles that joint together to form one, referred to as one muscle because it has one innervation point  Originates from iliac fossa  Actually three muscles if you consider femoris which originate from lumbar vertebrae from transverse processes and vertebral bodies come  Cannot separate psoas and lilacs- consider one muscle with multiple innervation  illiopsoas- Lesser trochanter of the femur  illiopsoas is a large hip flexor  almost entire sit up using illiopsoas muscle – last 15 deg is your abs  Sartorius- muscle that crosses leg (named after tailor) because they used to sit on floor  Originates from anterior superior iliac spine  Insertion point is on the medial tibia  Rectus femoris- insertion is the interior superior iliac spine  One of the quadricep muscles, straight muscle in the anterior thigh  only one of 4 that cross the hip The Gluteal Group  Large group that will be split into 2 based on innervation and origin  Maximus- originates from posterior ilia crest, down sacrum and portion of coccyx , very posterior origin  Insertion point is the gluteal tuberosity - unique bump to gluteal maximas  Contraction of fibers would cause lateral rotation of the hip b/c goes to the posterior side of femur  Primary leg extensor  Medius/ Minimus- lie on top of each other and perform identical functions  Same innervation and function, could consider them one but don’t because very clear which is which  Medius very small underneath  Originate off illium and insert onto greater trochanter of the femur on the anterior side of femur  b/c anterior contraction of the muscles will cause medial rotation of the hip joint  Additional function of abduction of hip joint (thigh)  Maximus is a muscle on its own, largest muscle  Medius and minimus is similar to each other, maximus should be its own muscle group b/c has its own insertion point and innervated to gluteal nerve, extensor and lateral rotator of hip joint , diff function  Medius and minimus- abduct thigh and cause medial rotation and have their own innervation of superior gluteal nerve  Red is lateral rotator muscles The Gluteal Group Cont. - Tensor Fascia Latae  Made out of fascia surrounds entire thigh  Embedded in fascia is an IT Band  Incorporates all muscles in thigh and ends at IT Band  Inside fascia is a muscle tensor fascia latae" - contracts makes tighter the fascia latae  Grab at thigh to pull up stocking- this is where tensor lies  Excessive tightening through fascia latae, often have a condition n which IT tract/ band tightens so much it pulls away from insertion point on side of knee - treated which a roller device run over IT Band to stretch it and loosen it  Muscle in same group as medius and minimus shares same innervation with slightly different function - doesn’t move or pull bone just tightens fascia  Superior gluteal nerve innervation The Lateral Rotators  Pisiforms- originates from anterior sacrum inserts onto greater trochanter of the femur  Imp to identify helps to see sciatic nerve  Obtruator Internus - muscle originates from rim around inner Obtruator internus and inserts onto greater trochanter  Above/below are two other muscles gemellus muscles- superior and inferior gemellus- attach to posterior femur and from posterior hip cause lateral rotation  Origin for super G is from ischial spine , inserts onto greater trochanter  Inferior G originates at greater tuberosity onto greater trochanter  Ouatratus Femoris  Inserts onto greater trochanter and again onto gluteal tuberosity  Innervation in region Id diff, many nerves but named afar muscle that its innervated  Muscles in red lining innervation is named after muscle -innervating pisiformis is nerve to pisiformis  Gemellus "twins" superior uses innervation from obturator internus and inferior gemellus borrows innervation from quatratus femoris  All muscles insert onto greater trochanter - anterior and borrows most posterior side of the greater trochanter allowing lateral rotation to occur  Muscles also act as abduction of the hip  Obturator externus- muscle similar to internus excepts originates from border around obturator foramen on external surface opposite side of the pelvis  Muscle lies within medial thigh muscles Medial Thigh Muscles  Also known as "groin muscles"- originate from the groin region  Injure them by pulling away from the groin region, run the length of the thigh, very large  Gracilis- straight and thin muscle, very medial, originates from inferior pubic rami  Border around Obtruator foramen  Inserts on the medial side of the tibia, crossing both the knee and hip joint  Accompanies sortoris by attaching to the gooses foot on medial side of tibia  Pectineus- short muscle  Originates from superior pectoral rami  Adductor Longus- originates very right to the articulation between 2 pubic bones, say origin is on pubic symphysis  2, one on each side of body  Portion of muscle originates from pubic body very medial origin Adductor Brevis- originates off the inferior pubic rami   See if cut away pectineus  Both brevis and longus insert on the linea aspera  Adductor Magnus- insertion on the linea aspera  Moves the furthest down on the linea aspera and ends on the adductor tubercle (funny bump)  Linea aspera runs all the way to the adductor tubercle  Hole on the adductor hiatus  Across group of muscles including magnus, all work to flex the hip, medially rotate hip joint and adduct hip joint  Innervation, common nerve is obturator nerve  In addition to adduction, flexion, medial rotation the adductor magnus also extends and laterally rotates the hip  Anterior fibres consistent with regulatory movements-flexion, adduction, medial rotation  If isolated posterior fibres you have extension and lateral rotation instead  Large origin that allows for multiple function of adductor magnus- inferior pubic rami and ischial rami- entire inferior border to obturator foramen The Magnus  Isolate posterior fibres b/c of large origin you have a larger angle of pull and lateral rotation  Angle of pull towards center of acetabulum causing abductor movement of the femur  Extension is an ar
More Less
Unlock Document

Only pages 1 and half of page 2 are available for preview. Some parts have been intentionally blurred.

Unlock Document
You're Reading a Preview

Unlock to view full version

Unlock Document

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.