FIBULA Leg anatomy bones presentation pptx

anatomy

1. FIBULA

2. SIDE DETERMINATION FEATURES: UPPER END (HEAD) SHAFT LOWER END (LATERAL MALLEOLUS)

3. 1. UPPER END (HEAD) EXPANDED IN ALL DIRECTIONS SUPERIOR SURFACE -> CIRCULAR ARTICULAR FACET -> ARTICULATES WITH LATERAL CONDYLE OF TIBIA APEX ( STYLOID PROCESS ) -> PROJECTS UPWARDS FROM ITS POSTEROLATERAL ASPECT NECK OF FIBULA: CONTRICTION IMMEDIATELY BELOW THE HEAD

4. 2. SHAFT BORDERS: ANTERIOR BORDER: BEGINS BELOW ANTERIOR ASPECT OF HEAD AT ITS LOWER END, IT DIVIDES TO ENCLOSE AN ELONGATED TRIANGULAR AREA, WHICH IS CONTINOUS WITH THE LATERAL SURFACE OF LATERAL MALLEOLUS POSTERIOR BORDER: IT IS ROUNDED ITS UPPER END LIES IN LINE WITH THE STYLOID PROCESS BELOW, THE BORDER IS CONTINOUS WITH THEMEDIAL MARGIN OF THE GROOVE ON THE BACK OF LATERAL MALLEOLUS INTEROSSEUS (MEDIAL) BORDER: IT LIES MEDIAL TO THE ANTERIOR BORDER, BUT ON A MORE POSTERIOR PLANE IT TERMINATES BELOW AT THE UPPER END OF A ROUGHENED AREA, ABOVE THE TALAR FACET OF THE LATERAL MALLEOLUS IN ITS UPPER TWO-THIRDS, THE INTEROSSEUS BORDER LIES VERY CLOSE TO THE ANTERIOR BORDER & MAY BECOME INDISTINGUISHIBLE FROM IT

5. SURFACES: MEDIAL SURFACE : B/W ANTERIOR & INTEROSSEUS BORDERS LATERAL SURFACE : B/W ANTERIOR & POSTERIOR BORDERS POSTERIOR SURFACE : IT IS THE LARGEST B/W INTEROSSEUS & POSTERIOR BORDERS IN ITS UPPER TWO-THIRDS, IT IS DIVIDED INTO TWO PARTS BY A VERTICAL RIDGE CALLED MEDIAL CREST

6. 3. LOWER END (LATERAL MALLEOLUS) TIP OF LATERAL MALLEOLUS IS 0.5CM LOWER THAN THAT OF MEDIAL MALLEOLUS SURFACES : ANTERIOR : ROUGH & ROUNDED POSTERIOR : MARKED BY A GROOVE LATERAL : SUBCUTANEOUS MEDIAL : BEARS A TRIANGULAR ARTICULAR FACET FOR TALUS (ANTERIORLY) & THE MALLEOLAR FOSSA (POSTERIORLY)

7. MUSCLE ATTACHMENTS: MEDIAL SURFACE OF SHAFT : EXTENSOR DIGITORUM LONGUS (A) EXTENSOR HALLUCIS LONGUS (A) PERONEUS TERTIUS (A) LATERAL SURFACE OF SHAFT : PERONEUS LONGUS (A) PERONEUS BREVIS (A) POSTERIOR SURFACE OF SHAFT : TIBIALIS POSTERIOR SOLEUS FLEXOR HALLUCIS LONGUS HEAD OF FIBULA : BICEPS FEMORIS (A)

8. ANTERIOR BORDER : ANTERIOR INTERMUSCULAR SEPTUM SUPERIOR EXTENSOR RETINACULUM SUPERIOR PERONEAL RETNACULUM POSTERIOR BORDER: POSTERIOR INTERMUSCULAR SEPTUM INTEROSSEUS BORDER : INTEROSSEUS MEMBRANE MEDIAL CREST: DEEP TRANSVERSE FASCIAL SEPTUM LATERAL MALLEOLUS : ANTERIOR TALOFIBULAR LIGAMENT INFERIOR TRANSVERSE TIBIOFIBULAR LIGAMENT POSTERIOR TIBIOFIBULAR LIGAMENT CAPSULE OF ANKLE JOINT