University:
Kentucky State University
Course:
BIO 301 | Human Anatomy
Academic year:

2021
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117

Pages:

79
Author:

strofamay56

Bones of Lower Limb Bones of the lower limb Hip Bone • Made up of 3 bones: 1) Ilium (flat), superior in position 2) Ischium (L), postero-inferior in position 3) Pubis (V), antero-inferior in position Ilium At puberty the triradiate cartilage starts to ossify and near the age of 17 the triradiate cartilage will be replaced by bony union The ilium, ischium and pubis meet one another by means of triradiate (Y-shaped) cartilage at the Acetabulum. The three bones meet at the Acetabulum: a socket on the lateral surface of hip bone where the femur head articulates to form the hip joint The hip bones articulate with the sacrum at the sacroiliac joints posteriorly The hip bones articulate with one another at the symphysis pubis anteriorly Sacroiliac joint Ilium Sacrum Symphysis pubis Lateral surface of hip bone Outer Gluteal Posterolateral Medial surface of hip bone Inner Pelvic Anteromedial Ilium Sacrum Left hip bone Lateral view Ilium Ala 1 3 2 Body 4 Consist of:  Two parts: body & wing (ala)  Four spines: 1: ASIS 2: AIIS 3: PSIS 4: PIIS  Two surfaces: Gluteal surface (outer) Sacropelvic surface (inner) The superior border of the wing: Iliac crest (palpable) Iliac tubercle The gluteal surface Anterior gluteal line Posterior gluteal line The gluteal surface is divided into 4 parts by three lines: 1- Posterior gluteal line 2- Anterior gluteal line (middle) 3- Inferior gluteal line Inferior gluteal line Superior Left hip bone Lateral view Posterior Anterior Inferior Superior Left hip bone Medial view Posterior Look at the hip bone from inner (medial) side Anterior Inferior Left hip bone Medial view The sacropelvic surface presents: 1- Iliac tuberosity: rough area that gives attachment to the interosseous and dorsal sacroiliac ligaments Iliac fossa Posterior Anterior 2- Auricular surface: Smooth area articulates with the sacrum to form the sacroiliac joint 3- Iliac fossa: Smooth area Medial border Forms the Arcuate line which extends to the Ilio-pubic eminence Iliac fossa Posterior Anterior Iliac tuberosity Posterior Anterior Auricular surface Posterior Anterior Arcuate line Posterior Anterior Look at the hip bone from inner (medial) side Ilio-pubic eminence Marks the point of union between ilium and pubis Posterior Anterior Pubis (anterior-inferior) Formed of a body and two rami: superior and inferior Pubic crest is the upper border of pubis Pubic crest ends laterally by the pubic tubercle The medial surface of the body articulates with the opposite pubis to form the pubic symphysis The inferior ramus of the pubic bone joins the ischial ramus to form the conjoined tendon. Pectineal line is a ridge on the superior pubic ramus Body Pectineal line of pubic bone Pubic tubercles Subpubic arch Ischium (posterior-inferior) Greater sciatic notch Ischial spine Lesser sciatic notch Ischial tuberosity Body Ischial ramus Ischial tuberosity (Sitting bone) Acetabulum It is a C-shaped cavity located on the lateral aspect of the hip bone  directed laterally, downwards and forwards  It is notched inferiorly by the acetabular notch which is bridged by the transverse acetabular ligament (part of the acetabular labrum) The acetabular ligament converts the acetabular notch into foramen Acetabular notch Lunate surface Acetabular fossa Its cavity presents a horse-shoe shaped articular surface called Lunate surface  The Lunate surface surrounds a non articular depression called acetabular fossa which is occupied by fat tissue in living Ilium The ilium forms the superior 2/5 of the lunate surface 2/5 1/5 The pubis forms the anterior 1/5 of the lunate surface Pubis 2/5 The ischium forms the posterior 2/5 of the lunate surface Posterior view The obturator canals for the passage of the obturator vessels and nerve Obturator foramen Covered by a membrane in living subjects Obturator muscles are attached to obturator membrane Posterior Anterior Posteriorly: 2 notches (greater & lesser sciatic notches) Posterior view Sacrum Ischial spine Coccyx The sacrospinous ligament is a thin, triangular ligament. The base of the ligament is attached to the sacrum and coccyx, and the tip attaches to the ischial spine Posterior view Sacrum PSIS Coccyx Ischial tuberosity Sacrotuberous ligament runs from the sacrum, coccyx and PSIS to the ischial tuberosity Posterior view   This pair of ligaments helps to transition the greater and lesser sciatic notches (indentations) into the greater and lesser sciatic foramina (openings). Greater sciatic foramen Lessor sciatic foramen Anatomical position of the hip bone It is very important to understand the anatomical position of the hip bone In anatomical position: 1-The Anterior superior iliac spine and the pubic tubercle lie in the same vertical plane. 2-The ischial spine and the upper border of the symphysis pubis lie in the same horizontal plane. The 2 hip bones with the sacrum form the pelvis Sacroiliac joint Now look! where does the pelvis look? It is looking right at you! Never upwards Ilium Sacrum During your first practical session, make sure to have a look at the anatomical position of the pelvis Symphysis pubis Abdominal aorta Right common iliac artery Abdominal aorta bifurcates into the left and right common iliac arteries Aortic bifurcation is at the level of the fourth lumbar vertebra L4 L4 Left common iliac artery External iliac artery Inguinal ligament Femoral artery The fact that the pelvis is facing (looking) forward is important to understand how structures passing from the pelvis smoothly to join the thigh Notice, the external iliac artery as it passes from the pelvis into thigh to become the femoral artery What do you think about the femoral nerve and vein? External iliac artery External iliac artery continues as femoral artery It enters the thigh from behind the inguinal ligament Femoral vein continues as External iliac vein It leaves the thigh from behind the inguinal ligament External iliac vein Femoral nerve Femoral artery Femoral vein The inguinal ligament is a band running from the pubic tubercle to the anterior superior iliac spine The inguinal ligament is formed by the external abdominal oblique aponeurosis External abdominal oblique Internal abdominal oblique Transversus abdominus Femur (thigh bone) • Longest, heaviest, and strongest bone in the body • Proximally: articulates with the acetabulum of the hip bone forming the hip joint • Distally: articulate with the tibia and patella forming the knee joint Proximal end 1. Head: (2/3 sphere) 2. Fovea capitis 3. Neck 4. Greater trochanter: (Lateral) 5. Lesser trochanter: (postero-medial) 6. Trochanteric fossa 7. Intertrochanteric line: (Anterior) 8. Intertrochanteric crest: (Posterior) 9. Quadrate tubercle 10. Gluteal tuberosity 11. Pectineal line of femur Shaft 1. Linea Aspera: (posterior) Distal end 1. Femoral Condyles (M & L) 2. Femoral epicondyles (M & L) 3. Intercondylar fossa (Posterior) 4. Patellar surface (Anterior) 5. Popliteal surface 6. Adductor tubercle Femur (thigh bone) Anterior view Trochanteric fossa Head Greater trochanter Neck Intertrochanteric line Lesser trochanter Patellar surface Adductor tubercle Lateral epicondyle Lateral Condyle Medial epicondyle Medial Condyle Posterior view Greater trochanter Quadrate tubercle Intertrochanteric crest Lesser trochanter Pectineal line Gluteal tuberosity Linea Aspera Popliteal surface Medial supracondylar line Adductor tubercle Medial Condyle Lateral supracondylar line Intercondylar fossa Lateral Condyle Pectineal line Medial supracondylar ridge Gluteal tuberosity Lateral supracondylar ridge The fovea capitis is an ovoid depression of the femoral head, and gives attachment to the ligament of head of femur The ligament of head of femur (round ligament of the femur, ligamentum teres femoris) Fovea capitis Head of femur Tibia • • Located medially Weight-bearing bone of the leg Medial malleolus (articulate with talus) Medial malleolus is at the distal end of tibia Lateral malleolus is at the distal end of fibula Anterior Lateral Condyle Medial Condyle Tibial tuberosity Intercondylar area and eminence Anterior border Lateral surface Anterior border Medial border (Interosseous) Lateral border (Interosseous) Posterior surface Posterior border Cross section in the shaft of fibula Cross section in the shaft of tibia Medial border Lateral Condyle Medial Condyle Fibular facet Tibial tuberosity Interosseous border Lateral surface Medial border Medial surface Anterior border shin tibia Medial malleolus Soleal line Posterior surface Medial surface Anterior border (shin tibia) The shaft of the tibia is subcutaneous and unprotected anteromedially throughout its course. It is not surprising that the tibia is the commonest long bone to be fractured Provides origin to The muscles in the lateral compartment of the leg Lateral surface Provides origin to the extensor muscles of the leg (Extensor surface) Provides origin to some of the flexor muscles of the leg (Flexor surface) Cross section in the shaft of fibula Fibula  The lateral bone of the leg  Slender bone, smaller than tibia: (No articulation with femur) Head Lateral malleolus (articulate with talus) Articular facet of the head Styloid process Head Neck Malleolar fossa, located on the medial surface of the lateral malleolus Inferior Posterior medial Helps to determine left or right Subcutaneous triangular area Lateral malleolus Patella patellar ligament  Known as the kneecap  Is triangular  Articulates with the femur  Covers and protects the anterior articular surface of the knee joint  Is the largest sesamoid bone in the body is embedded in the quadriceps femoris tendon Upper part: Serves for the attachment of the tendon of the quadriceps muscle Lower part: Serves as the origin of the patellar ligament Tibial tuberosity The patellar ligament inserts into tibial tuberosity Bones of the foot Tarsals (7) Metatarsals (5) Phalanges (14) Tarsal bones 1. Talus 2. Calcaneus 3. Navicular (little boat) 4. Medial Cuneiform (wedge-shape) 5. Intermediate Cuneiform 6. Lateral Cuneiform 7. Cuboid Tarsals Metatarsals Phalanges Calcaneus (heel= ‫)كعب‬ Talus (ankle= ‫)كاحل‬ Subtalar joint Calcaneus Planter surface of the foot (inferior) Talus Planter surface of the foot (inferior) Head of Talus Planter surface of the foot (inferior) Navicular bone Planter surface of the foot (inferior) Medial cuneiform bone Planter surface of the foot (inferior) Intermediate cuneiform bone Planter surface of the foot (inferior) Lateral cuneiform bone Planter surface of the foot (inferior) Cuboid Planter surface of the foot (inferior) Tuberosity of the fifth metatarsal bone 5th 4th 1st 2nd 3rd Proximal phalanx Middle phalanx Distal phalanx The knee joint consists of two joints: 1- between the femur and tibia (tibiofemoral joint) 2- between the femur and patella (patellofemoral joint). The ankle joint is the joint between the talus and the distal ends of tibia and fibula The femoral triangle The popliteal fossa The posteromedial side of the ankle (Tarsal tunnel) are important areas of transition through which structures pass between regions The femoral triangle is a pyramid-shaped depression formed by muscles in the proximal regions of the thigh and by the inguinal ligament. The major blood supply and one of the nerves of the limb (femoral nerve) enter into the thigh from the abdomen by passing under the inguinal ligament and into the femoral triangle. The popliteal fossa is posterior to the knee joint and is a diamond-shaped region formed by muscles of the thigh and leg. Major vessels and nerves pass between the thigh and leg through the popliteal fossa. The posteromedial side of the ankle: Most nerves, vessels, and flexor tendons that pass between the leg and foot pass through a series of canals (tarsal tunnel) on the posteromedial side of the ankle. The canals are formed by adjacent bones and a flexor retinaculum, which holds the tendons in position

Bones of Lower Limb

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