The Intraneural Plexus of Fasciculi and Fibers in the Sciatic Nerve

Abstract

But if the incision cuts into the nerve ju t above the point of ongm of a branch the signs of complete division of that branch are produced. In certain ituations also-for example, in the anterior primary division of "the fifth cervical nerve-the nen•e fiber are arranged in a well-defined order, and incomplete division of this nerve may entail complete •division of those motor fiber which supply the spinati and the deltoid muscles. Again, in the trunk 3. ~farie, P.: Des resultats fournis par l'electrisation directe des troncs nerveux clan la plaie operatoire chez !es hie ses atteints de traumatismes des nerfs, Bull. de l'Acad. de med.

Mapping the Fascicular Morphology and Organization of the Human Sciatic Nerve via High-Resolution MicroCT Imaging

“…Our study suggests that fascicles innervating specific hamstring muscles can be tracked for considerable distances (e.g., up to 13 cm for ST). This finding aligns with early observations from serial histological cross sections (McKinley, 1921) and provides significantly more continuous and confident tracking. Notably, these distances fall within surgically accessible locations throughout the posterior thigh, particularly between the ischial tuberosity and the greater trochanter of the femur at the level of the gluteal fold.…”

Mapping the Fascicular Morphology and Organization of the Human Sciatic Nerve via High-Resolution MicroCT Imaging

“…Our study suggests that fascicles innervating specific hamstring muscles can be tracked for considerable distances (e.g., up to 13 cm for ST). This finding aligns with early observations from serial histological cross sections (McKinley, 1921) and provides significantly more continuous and confident tracking. Notably, these distances fall within surgically accessible locations throughout the posterior thigh, particularly between the ischial tuberosity and the greater trochanter of the femur at the level of the gluteal fold.…”

Human distal sciatic nerve fascicular anatomy: Implications for ankle control using nerve-cuff electrodes

“…This pattern was observed in all three specimens, and was consistent with McKinley's study [17], though the latter had the DF and SF grouped together (Figure 3). Sunderland and Ray's tracing of the common fibular was detailed in the distal nerve, but the fascicles became intermixed more proximally, making functional grouping impossible [18], and hence was not shown for comparison.…”

“…Higher resolution sectioning (250 m) improved tracing or identifying interfascicular plexusing in some nerve tissue sections. The observed fascicular anatomy was generally consistent with previous work [17][18] at the distal branches of the sciatic, below the joint space. McKinley did not identify subgroups proximal to the sciatic bifurcation [17], and Sunderland and Ray were unable to distinctly trace unique fascicles above the joint space because of interfascicular plexusing [18].…”

“…The observed fascicular anatomy was generally consistent with previous work [17][18] at the distal branches of the sciatic, below the joint space. McKinley did not identify subgroups proximal to the sciatic bifurcation [17], and Sunderland and Ray were unable to distinctly trace unique fascicles above the joint space because of interfascicular plexusing [18]. Although early studies reported difficulties tracing fascicular anatomy along nerves [18], more recent work [28] and work from our laboratory [22,29] has demonstrated that fascicular tracing is consistent in a number of peripheral nerves.…”

“…The nerve branching patterns were consistent with general morphology [25] and the two previous studies, McKinley [17] and Sunderland and Ray [18], with minor variations. There is sufficient branch-free length of the distal sciatic proximal to the bifurcation for nerve-cuff placement (Table: 5.1 ± 1.5 cm; range 3.7-6.7 cm).…”

Mapping the Fascicular Morphology and Organization of the Human Sciatic Nerve via High-Resolution MicroCT Imaging

“…Our study suggests that fascicles innervating specific hamstring muscles can be tracked for considerable distances (e.g., up to 13 cm for ST). This finding aligns with early observations from serial histological cross sections (McKinley, 1921) and provides significantly more continuous and confident tracking. Notably, these distances fall within surgically accessible locations throughout the posterior thigh, particularly between the ischial tuberosity and the greater trochanter of the femur at the level of the gluteal fold.…”

Human distal sciatic nerve fascicular anatomy: Implications for ankle control using nerve-cuff electrodes

“…This pattern was observed in all three specimens, and was consistent with McKinley's study [17], though the latter had the DF and SF grouped together (Figure 3). Sunderland and Ray's tracing of the common fibular was detailed in the distal nerve, but the fascicles became intermixed more proximally, making functional grouping impossible [18], and hence was not shown for comparison.…”

“…Higher resolution sectioning (250 m) improved tracing or identifying interfascicular plexusing in some nerve tissue sections. The observed fascicular anatomy was generally consistent with previous work [17][18] at the distal branches of the sciatic, below the joint space. McKinley did not identify subgroups proximal to the sciatic bifurcation [17], and Sunderland and Ray were unable to distinctly trace unique fascicles above the joint space because of interfascicular plexusing [18].…”

“…The observed fascicular anatomy was generally consistent with previous work [17][18] at the distal branches of the sciatic, below the joint space. McKinley did not identify subgroups proximal to the sciatic bifurcation [17], and Sunderland and Ray were unable to distinctly trace unique fascicles above the joint space because of interfascicular plexusing [18]. Although early studies reported difficulties tracing fascicular anatomy along nerves [18], more recent work [28] and work from our laboratory [22,29] has demonstrated that fascicular tracing is consistent in a number of peripheral nerves.…”

“…The nerve branching patterns were consistent with general morphology [25] and the two previous studies, McKinley [17] and Sunderland and Ray [18], with minor variations. There is sufficient branch-free length of the distal sciatic proximal to the bifurcation for nerve-cuff placement (Table: 5.1 ± 1.5 cm; range 3.7-6.7 cm).…”

Mapping the Fascicular Morphology and Organization of the Human Sciatic Nerve via High-Resolution MicroCT Imaging

“…Our study suggests that fascicles innervating specific hamstring muscles can be tracked for considerable distances (e.g., up to 13 cm for ST). This finding aligns with early observations from serial histological cross sections (McKinley, 1921) and provides significantly more continuous and confident tracking. Notably, these distances fall within surgically accessible locations throughout the posterior thigh, particularly between the ischial tuberosity and the greater trochanter of the femur at the level of the gluteal fold.…”

Human distal sciatic nerve fascicular anatomy: Implications for ankle control using nerve-cuff electrodes

“…This pattern was observed in all three specimens, and was consistent with McKinley's study [17], though the latter had the DF and SF grouped together (Figure 3). Sunderland and Ray's tracing of the common fibular was detailed in the distal nerve, but the fascicles became intermixed more proximally, making functional grouping impossible [18], and hence was not shown for comparison.…”

“…Higher resolution sectioning (250 m) improved tracing or identifying interfascicular plexusing in some nerve tissue sections. The observed fascicular anatomy was generally consistent with previous work [17][18] at the distal branches of the sciatic, below the joint space. McKinley did not identify subgroups proximal to the sciatic bifurcation [17], and Sunderland and Ray were unable to distinctly trace unique fascicles above the joint space because of interfascicular plexusing [18].…”

“…The observed fascicular anatomy was generally consistent with previous work [17][18] at the distal branches of the sciatic, below the joint space. McKinley did not identify subgroups proximal to the sciatic bifurcation [17], and Sunderland and Ray were unable to distinctly trace unique fascicles above the joint space because of interfascicular plexusing [18]. Although early studies reported difficulties tracing fascicular anatomy along nerves [18], more recent work [28] and work from our laboratory [22,29] has demonstrated that fascicular tracing is consistent in a number of peripheral nerves.…”

“…The nerve branching patterns were consistent with general morphology [25] and the two previous studies, McKinley [17] and Sunderland and Ray [18], with minor variations. There is sufficient branch-free length of the distal sciatic proximal to the bifurcation for nerve-cuff placement (Table: 5.1 ± 1.5 cm; range 3.7-6.7 cm).…”