ANATOMY - Hindlimb Flashcards
What are the seven bones of the hindlimb?
Pelvis
Femur
Tibia
Fibula
Tarsal bones
Metatarsal bones
Phalanges
What are the seven joints of the hindlimb?
Sacro-iliac joint
Hip
Stifle
Tarsal joint
Metatarsophalangeal fetlock
Proximal interphalangeal joint
Distal interphalangeal joint
In which region of the hindlimb is the pelvis located?
Gluteal region
Which type of bone is the pelvis?
Flat bone
What are the four regions of the pelvis?
Ilium
Ischium
Pubis
Acetabulum
What is the cartilaginous joint which fuses the two sides of the pelvis together?
Pelvic symphysis
(T/F) The ilium is palpable
TRUE.
What are the two regions of the ilium?
Wing
Body
How does the orientation of the wing of the ilium vary between species?
The wing of the ilium is more vertical in small animals however it is more horizontal in large animals
What are the two projections at the wing of the ilium seen in large animals?
Tuber sacrale
Tuber coxae
What is the clinical significance of the wing of the ilium in small animal practice?
The wing of the ilium is commonly used for bone marrow sampling in small animals
What is the point of muscle attachment for the reproductive organs?
Ischiatic arch
Which structure on the ischium is palpable in all species?
Tuber ischium
Which two regions of the pelvis form the borders of the obturator foramen?
Ischium
Pubis
Which important structure runs through the obturator foramen?
Obturator nerve
Which muscle attaches to the cranial arch of the pubis via the pre-pubic tendon?
Rectus abdominas muscle
What lines the rim of the acetabulum?
The rim of the acetabulum is lined by the cartilaginous labrum
What is the name of the articular surface of the acetabulum?
Lunate surface
What is the central depression of the acetabulum?
Acetabular fossa
Which ligament bridges the acetabular notch?
Transverse ligament
Where are the four primary centres of ossification located within the pelvis?
Ilium
Ischium
Pubis
Acetabulum
What are the three secondary centres of ossification located within the pelvis?
Dorsal wing of the ilium
Tuber ischium
Ischiatic arch
What type of joint is the sacro-iliac joint?
Fibrous joint
What are the articulating surfaces of the sacro-iliac joint?
Sacrum
Wing of the ilium
What is the function of the sacro-iliac joint?
The sacro-iliac joint transmits mechanical forces from the hindlimb to the vertebral column during propulsion
Which two structures of the hindlimb soften during parturition in large animals?
Sacro-iliac joint
Sacrotuberous ligament
How does the structure of the sacrotuberous ligament differ between species?
In large animals, the sacrotuberous ligament is a broad, fibrous sheet with holes to allow nerves to pass through whereas in small animals, the sacrotuberous ligament is a fibrous cord
How can the sarotuberous ligament be used during perineal surgery?
The sacrotuberous ligament provides an anchor for stitches during surgery of the perineal region
In which region of the hindlimb is the femur located?
Thigh region
Which type of bone is the femur?
Long bone
Identify the following features of the femur
What is the proximal subchondral bone of the femur?
Head of the femur
Why is the femoral head so vulnerable to a loss of blood supply?
The femoral head relies on the blood supply which passes throught the femoral neck. The femoral neck is susceptible to fractures which can cause damage this blood supply and lead to avascular necrosis of the femoral head
What is the name of the central depression seen in the head of the femur?
Fovea
What is the palpable landmark for the hip present at the proximal end of the femur?
Greater trochanter
What are the two distal subchondral bones of the femur?
Lateral condyle
Medial condyle
What is the name of the fossa between the medial and lateral condyles at the distal end of the femur?
Intercondylar fossa
What is the structure on the lateral surface of the femur which articulates with the patella?
Trochlear groove
Which two structures on the femur stabilise the patella within the trochlear groove?
Medial trochlear ridge
Lateral trochlear ridge
Describe the species differences seen in the equine femur?
In the equine femur, the medial trochlear ridge is larger than the lateral trochlear ridge and has an additional tuberosity
What type of joint is the hip?
Ball and socket synovial joint
What are the articular surfaces of the hip joint?
Lunate surface of the acetabulum
Head of the femur
(T/F) The hip does not have collateral ligaments
TRUE.
Which ligament stabilises the hip joint in all species?
Ligament of the head of the femur
What is the origin and insertion of the ligament of the head of the femur?
The ligament of the head of the femur originates at the fovea of the femur and inserts onto the acetabular fossa of the pelvis
What is the additional ligament which supports the hip in large animals?
Accessory ligament extending from the pre-pubic tendon
Why does the hip joint not undergo abduction or adduction in large animals?
The hip joint does not undergo abduction or adduction in the large animal due to the extensive muscle mass surrounding the joint
What are the two long term treatment methods for hip dysplasia?
Total hip replacement
Femoral head excision
What type of bone are the tibia and fibula?
Long bones
(T/F) The tibia and fibula have a degree of rotation
FALSE. The tibia and fibula have no rotation
Identify the following structures of the tibia and fibula
What are the two subchondral bones of the proximal tibia?
Medial condyle
Lateral condyle
What is the name of the ridge between the medial and lateral condyles at the proximal end of the tibia?
Intercondylar ridge
What is the point of insertion for the patellar ligament at the proximal end of the tibia?
Tibial tuberosity
What is the purpose of the medial malleolus located at the distal end of the tibia?
Medial malleolus is the point of attachment for the medial collateral ligament of the tarsal joint
What is the purpose of the lateral malleolus located at the distal end of the fibula?
Lateral malleolus is the point of attachment for the lateral collateral ligament of the tarsal joint
Which species have an isolated lateral malleolus?
Ruminants
Why would you only repair a distal fracture of the fibula?
If the lateral malleolus is broken, it will need to be repaired because attachment of collateral ligaments will be affected causing instability of the tarsal joint
Where are the four centres of ossification located within the tibia?
Proximal epiphysis
Tibial tuberosity
Body of the tibia
Distal epiphysis
Where are the three centres of ossification located within the fibula?
Proximal epiphysis
Body of the fibula
Distal epiphysis
What kind of joint is the stifle joint?
Synovial joint
What are the two main regions of the stifle joint?
Femorotibial region
Femoropatellar region
What are the four articulating surfaces of the femorotibial region of the stifle joint?
Medial femoral condyle
Lateral femoral condyle
Medial tibial condyle
Lateral tibial condyle
What is the function of the menisci?
Menisci are cartilaginous wedges attached to the tibial condyles which allow for stifle joint congruity
Which four ligaments provide stability for femorotibial region of the stifle joint?
Medial collateral ligament
Lateral collateral ligament
Cranial cruciate ligament
Caudal cruciate ligament
Which test can be used to diagnose a cranial cruciate ligament rupture?
Cranial draw test
What are the articulating surfaces of the femoropatellar region of the stifle joint?
Trochlear groove
Patella
What kind of bone is the patella?
Sesamoid bone
Which ligament is the patella embedded within?
Patellar ligament
What are the three patellar ligaments found in equids?
Medial patellar ligament
Middle patellar ligament
Lateral patellar ligament
Where do the three patellar ligaments found in equids insert?
The three patellar ligaments found in equids insert onto the additional tuberosity found on the medial trochlear ridge
Which five structures provide stability to the patella within the trochlear groove of the tibia?
Medial trochlear ridge
Lateral trochlear ridge
Medial femoro-patellar ligament
Lateral femoro-patellar ligament
Fasia latae
Where do the medial and lateral femoro-patellar ligaments originate and insert?
The medial and lateral femoro-patellar ligaments originate at the patella and run to the fabellae sesamoids
Which muscle are the fabellae sesamoids embedded within?
Gastrocnemius muscle
Which muscle is the popliteal sesamoid embedded within?
Popliteal muscle
How does the patellar locking mechanism contribute to the equine stay apparatus?
The patellar locking mechanism locks the stifle joint in extension to allow the other hindlimb to rest
Describe the process of the equine patellar locking mechanism
The patella is pulled proximally and rotated medially as the stifle is extended. The medial rotation of the patella causes sit between the medial and middle patellar ligaments, preventing flexion of the stifle
What are the eight thigh muscles?
Gluteal muscles
G.A.P.E muscles
Quadriceps muscles
Sartorius muscles
Iliopsoas muscles
Biceps femoris muscles
Semitendonosus muscles
Semimembranosus muscles
What are the two points of origin for the gluteal muscles?
Sacrum
Pelvis
What is the point of insertion for the gluteal muscles?
Greater trochanter
What is the main function of the gluteal muscles in small animals?
The gluteal muscles are hindlimb abductors in small animals
What are the two main functions of the gluteal muscles in large animals?
The gluteal muscles are hindlimb retractors and hip extensors
Which nerve innervates the gluteal muscles?
Gluteal nerve
What are the four G.A.P.E muscles?
Gracilis muscle
Adductor muscle
Pectineus muscle
External obturator muscle
What is the point of origin for the gracilis muscle?
Ventral pelvis
What are the two points of insertion for the gracilis muscle?
Medial tibia
Calcaneus tarsal bone (via common calcanean tendon)
What is the point of origin for the adductor muscle?
Ventral pelvis
What is the point of insertion for the adductor muscle?
Medial femur
What is the point of origin for the pectineus muscle?
Ventral pelvis
What is the point of insertion for the pectineus muscle?
Medial femur
What is the function of the G.A.P.E muscles?
The G.A.P.E muscles are hindlimb adductors
The Gracilis is also a tarsal extensor
Which nerve innervates the G.A.P.E muscles?
Obturator nerve
What are the four heads of the quadriceps muscle?
Rectus femorus
Vatus lateralis
Vatus medialis
Vatus intermedius
What is the point of origin for the rectus femorus head of the quadriceps muscle?
Ilium
What is the point of insertion for the rectus femorus head of the quadriceps muscle?
Tibial tuberosity
Via the patellar tendon
What are the three functions of the rectus femorus head of the quadriceps muscle?
The rectus femorus head of the quadriceps muscle is a hindlimb protractor, hip flexor and stifle extensor
What is the point of origin for the vatus lateralis, vatus medialis and vatus intermedias heads of the quadriceps muscle?
Femur
What is the point of insertion for the vastus lateralis, vastus medialis and vastus intermedias heads of the quadriceps muscle?
Tibial tuberosity
Via the patellar tendon
What is the function of the vastus lateralis, vastus medialis and vastus intermedias heads of the quadriceps muscle?
The vastus lateralis, vastus medialis and vastus intermedias heads of the quadriceps muscle are stifle extensors
Via which structure does the quadriceps muscle insert onto the tibial tuberosity?
Patellar tendon
Which nerve innervates the quadriceps muscle?
Femoral nerve
What is the point of origin of the sartorius muscle?
Ilium
What are the two points of insertion of the sartorius muscle?
Femur
Tibial tuberosity
Via the patellar tendon
Via which structure does the sartorius muscle insert onto the tibial tuberosity?
Patellar ligament
What are the three functions of the sartorius muscle?
The sartorius muscle is a hindlimb protractor, hip flexor and stifle extensor
Which nerve innervates the sartorius muscle?
Femoral nerve
What are the two points of origin for the iliopsoas muscle?
Lumbar vertebrae
Ilium
What is the point of insertion of the iliopsoas muscle?
Femur
What are the two functions of the iliopsoas muscle?
The iliopsoas muscle is a hindlimb protractor and hip flexor
Which nerve innervates the iliopsoas muscle?
Femoral nerve
What is the point of origin for the biceps femoris muscle?
Tuber ischium
What are the two points of insertion for the biceps femoris muscle?
Fascia latae
Calcaneus tarsal bone (via the common calcanean tendon)
What are the four functions of the biceps femoris muscle?
The biceps femoris muscle is a hindlimb retractor, hip extensor and stifle flexor. Also a tarsal extensor
Which nerve innervates the biceps femoris muscle?
Sciatic nerve
What is the point of origin for the semitendonous muscle?
Tuber ischium
What are the two points of insertion for the semitendonous muscle?
Lateral tibia
Calcaneus tarsal bone (via the common calcanean tendon)
What are the four functions of the semitendonous muscle?
The semitendonous muscle is a hindlimb retractor, hip extensor and stifle flexor. Also a tarsal extensor
Which nerve innervates the semitendonous muscle?
Sciatic nerve
What is the point of origin for the semimembranous muscle?
Tuber ischium
What are the two points of insertion for the semimembranosus muscle?
Medial tibia
Medial femur
What are the three functions of the semimembranosus muscle?
The semimembranosus muscle is a hindlimb retractor, hip extensor and stifle flexor
Which nerve innervates the semimembranous muscle?
Sciatic nerve
Via which tendon do the gracilis, biceps femoris and semitendonosus muscles insert onto the calcaneus tarsal bone?
Common calcanean tendon
Which type of bone are the tarsal bones?
Short bones
What are the three rows of tarsal bones?
Proximal layer
Middle layer
Distal layer
List the proximal row of tarsal bones from medial to lateral
Talus tarsal bone
Calcaneus tarsal bone
List the middle row of tarsal bones from medial to lateral
Central tarsal bone
4th tarsal bone
List the distal row of tarsal bones from medial to lateral
1st tarsal bone
2nd tarsal bone
3rd tarsal bone
4th tarsal bone
Which tarsal bone is palpable?
Calcaneus tarsal bone
Which tarsal bones are fused in equids?
1st and 2nd tarsal bones are fused in equids
Which tarsal bone has more than one centre of ossification?
Calcaneus tarsal bone
What type of joint is the tarsal joint?
Synovial joint
List the four inter-tarsal joints
Tibio-tarsal joint
Proximal inter-tarsal joint
Distal inter-tarsal joint
Tarso-metatarsal joint
What is the function of the planter ligament?
The planter ligament counteracts the forces applied to the calcaneus tarsal bone to prevent joint collapse and hyperextension
What is ‘bone spavin’?
Equine degenerative joint disease of the tarsal joint
What are the six distal intrinsic muscles of the hindlimb?
Cranial tibial muscle
Peroneus muscle
Long digital extensor muscle
Gastrocnemius muscle
Superficial digital flexor muscle
Deep digital flexor muscle
What is the point of origin for the cranial tibial muscle?
Proximal tibia
What is the point of insertion for the cranial tibial muscle?
Metatarsal bones
Which tendon allows the cranial tibial muscle to insert upon the medial tarsus in the horse?
Cunean tendon
What is the function of the cranial tibial muscle?
The cranial tibial muscle is a tarsal flexor
Which nerve innervates the cranial tibial muscle?
Fibular branch of the sciatic nerve
What is the name of the peroneus muscle in small animals?
Peroneus longus muscle
What are the two points of origin for the peroneus longus muscle?
Tibia
Fibula
What is the point of insertion for the peroneus longus muscle?
Planter tarsus
What is the name of the peroneus muscle in equids?
Peroneus tertias
What is the point of origin for the peroneus tertias muscle?
Lateral femoral condyle
What are the two points of insertion for the peroneus tertias muscle?
Third metatarsal
Tarsus
What is the function of the pernoeus muscle?
The peroneus muscle is a tarsal flexor
Which nerve innervates the peroneus muscle?
Fibular branch of the sciatic nerve
(T/F) The long digital flexor muscle originates and inserts via a tendon
TRUE.
What is the point of origin for the long digital extensor tendon?
Femur
What is the point of insertion for the long digital extensor tendon?
Extensor process of distal phalanx
Where does the long digital extensor tendon insert within the horse?
All the phalanges (proximal, middle and distal)
What are the functions of the long digital extensor muscle?
The long digital extensor muscle is a tarsal flexor and digital extensor
Which nerve innervates the long digital extensor muscle?
Fibular branch of the sciatic nerve
What are the five components of the common calcanean tendon?
Gracilis muscle
Biceps femoris muscle
Semitendonous muscle
Gastrocnemius muscle
Superficial digital flexor muscle
What is the point of insertion for the common calcanean tendon?
Calcaneus tarsal bone
What is the function of the common calcanean tendon?
The common calcanean tendon is a tarsal extensor
What is the point of origin for the gastrocnemius muscle?
Femur
What is the point of insertion for the gastrocnemius muscle?
Calcaneus tarsal bone via the common calcanean tendon
What are the functions of the gastrocnemius muscle?
The gastrocnemius muscle is a stifle flexor and tarsal extensor
Which nerve innervates the gastrocnemius muscle?
Tibial branch of the sciatic nerve
What is the point of origin for the superficial digital flexor muscle?
Femur
What are the two points of insertion for the superficial digital flexor muscle?
Calcaneus tarsal bone (via common calcanean tendon) and the planter surface of the middle phalanx
What are the functions of the superficial digital flexor muscle?
The superficial digital flexor muscle is a tarsal extensor and digital flexor
Which nerve innervates the superficial digital flexor muscle?
Tibial branch of the sciatic nerve
What is the point of origin for the deep digital flexor muscle?
Tibia
What is the point of insertion for the deep digital flexor muscle?
Planter process of distal phalanx
What are the functions of the deep digital flexor muscle?
The deep digital flexor muscle is a tarsal extensor and digital flexor
Which nerve innervates the deep digital flexor muscle?
Tibial branch of the sciatic nerve
Which components of the equine stay apparatus prevents flexion of the hip joint?
There is no passive mechanism which prevents flexion of the hip joint within the equine stay apparatus
Which components of the equine stay apparatus prevents flexion of the stifle joint?
The patellar locking mechanism
Which structures within the equine stay apparatus prevents hyperextension of the metatarsophalangeal joint, proximal interphalangeal joint and distal interphalangeal joint?
Superficial digital flexor tendon
Deep digital flexor tendon
DDFT Accessory check ligament
Annular ligaments
Which additional apparatus prevents hyperextension of the metatarsophalangeal joint?
Suspensory apparatus
What are the two components of the equine reciprocal apparatus?
Peroneus tertias muscle
Superficial digital flexor muscle
What is the function of the equine reciprocal apparatus?
Ensures the stifle and the tarsal joint flex and extend in unison to contribute to the equine stay apparatus